综合能力训练卷(六)
第一部分英语知识运用(共两节，满分45分)
第一节单项填空(共15小题；每小题1分，满分15分)
从每题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1．All the organizations involved have sent urgent ________ to government, asking for extra funding.
A．appeals B．replies
C．consultation D．contracts
2．My father gives me five hundred yuan a month which I think can________ all my expenses.
A．meet B．contain C．include D．cover
3．When a new disease breaks out, experts must ________ what to do in the fastest way.
A．figure out B．take out
C．point out D．make out
4．What a pity! I missed meeting my friend at the airport because my car was ________ in the traffic jam.
A．broken up B．held up
C．kept back D．kept up
5．Unemployment is on the increase. A growing number of young people, ________， are finding themselves out of work.
A．in case B．all in all
C．in particular D．as a result
6．It is obvious that talking about something behind others is what everyone will not ________.
A．come up with B．put up with
C．keep up with D．catch up with
7．The government ________ to the country to pay more attention to A/H1N1 flu.
A．appealed B．suggested
C．called D．explained
8．Our English teacher is our favorite. She's kind and humorous, but ________， she is strict with us.
A．in other words B．on the other hand
C．after all D．in all
9．The bell rang and every student had to________their examination papers.
A．give up B．give away
C．give out D．give in
10．His sacrifices for the country were never officially________， which made all of us feel discouraged.
A．acknowledged B．appealed
C．recommended D．evaluated
11．—How many people are still leading ________ life under ________ poverty line in the world?
—Perhaps one fourth.
A．a; the B．a; a
C．/; / D．the; /
12．The computer system ________ suddenly while he was searching for information on the Internet.
A．broke down B．broke out
C．broke up D．broke in
13．To catch up with the times, we must keep ourselves ________of the
current news.
A．warned B．informed
C．convinced D．accused
14．—What a pleasant ________ these trees give us!
—Why not stop and enjoy the cool air?
A．shade B．shadow C．picture D．scene
15．—Perhaps we should give up.
—Nobody can ________ the change of situation.
A．predict B．present C．prepare D．prefer
第二节完形填空(共20小题；每小题1.5分，满分30分)
阅读下面短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。
I was tired and hungry after a long day of work. When I walked into the living-room, my 12-year-old son looked up at me and said, “I__16__you.”
I did not__17__what to say, and I just stood there, looking__18__at him. My first__19__was that he__20__need help with his homework. Then I asked, “What was that all__21__？”
“Nothing，” he said, “My teacher said we should tell our parents we love them and__22__what they say.”
The next day I called his teacher to__23__more about what my son said and how the other parents had reacted( 反应). “Most of the fathers had the__24__response as you did，” the teacher said, “When I first__25__that we try this, I asked the children__26__they thought their parents__27__say. Some of them thought their parents would have heart trouble.”
Then the teacher__28__，“ I want my students to know that feeling love is an important part of__29__. I'm trying to tell them it's too bad that we don't express our feelings. A boy__30__tell his father or mother he loves him or her.” The teacher understands that sometimes it is__31__for some of us to say something that is good for us to say.
That evening when my son__32__to me, I took him in my arms and held on for an__33__moment, saying, “Hey, I love you，__34__.” I don't know if saying that made__35__of us healthier, but it did feel pretty good.
16．A.hate B．love C．like D．enjoy
17．A.realize B．recognize
C．know D．find
18．A.away B．for C．down D．on
19．A.thought B．meaning
C．news D．reason
20．A.must B．should C．could D．would
21．A.for B．with C．around D．about
22．A.test B．know
C．understand D．see
23．A.talk to B．chat with
C．find out D．do with
24．A.same B．different C．usual D．unusual
25．A.allowed B．agreed
C．planned D．suggested
26．A.how B．whether C．when D．what
27．A.would B．will C．could D．can
28．A.explained B．prepared
C．informed D．developed
29．A.study B．work C．health D．body
30．A.might B．can C．should D．need
31．A.easy B．difficult
C．crazy D．silly
32．A.turned B．shouted C．went D．came
33．A.extra B．ordinary
C．interesting D．important
34．A.either B．too C．also D．again
35．A.all B．either C．none D．neither
第二部分阅读理解(共两节，满分40分)
第一节(共15小题；每小题2分，满分30分)
阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。
A
Even plants can run a fever, especially when they're under attack by insects or disease. But unlike human, plants can have their temperature taken from 3,000 feet away—straight up. A decade ago, adopting the infrared(红外线)scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide(杀虫剂)spraying rather than rain poison on a whole field, which invariably includes plants that don't have pest problems.
Even better, Paley's Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3,000 feet at night, an infrared scanner measured the heat emitted by crops. T he data were transformed into a colour-coded map showing where plants were running “fevers”. Farmers could then spot-spray, using 50 to 70 percent less pesticide than they otherwise would.
The bad news is that Paley's company closed down in 1984, after only three years. Farmers resisted the new technology and long-term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. “This technique
can be used on 75 percent of agricultural land in the United States, ” says George Oerther of Texas A & M. Ray Jackson, who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only if Paley finds the financial backing which he failed to obtain 10 years ago.
36．Plants will send out an increased amount of heat when they are________.
A．facing an infrared scanner
B．sprayed with pesticides
C．in poor physical condition
D．exposed to excessive sun rays
37．In order to apply pesticide spraying precisely, we can use infrared scanning to________.
A．estimate the damage to the crops
B．draw a colour-coded map
C．measure the size of the affected area
D．locate the problem area
38．Farmers can save a considerable amount of pesticide by________.
A．resorting to spot-spraying
B．transforming poisoned rain
C．consulting infrared scanning experts
D．detecting crop problems at an early stage
39．The application of infrared scanning technology to agriculture met with some difficulties—________.
A．its high cost
B．the lack of official support
C．the lack of financial support
D．its failure to help increase production
B
Nuclear-powered aircraft carriers are considered one of the most important marine weapons in the 20th century. So far, only two countries in the world, the USA and France, have ever produced them. But these fearful fighting machines are about to enter Asia.
The US Navy said last month that one of its ni ne nuclear-powered aircraft carriers will be sent to Japan to replace the diesel(柴油)-powered carrier Kitty Hawk in 2020. In an agreement on October 30, the two countries also planned to level up their military (军事的) cooperation and the USA called for Japan to take a larger role in alliance military moves.
It will be the first time that a nuclear-powered carrier is based in Japan. Bombed by US forces in World War Ⅱ at Hiroshima and Nagasaki, Japan is the only world country to have been attacked by a nuclear weapon. Therefore, the citizens are highly sensitive to where nuclear-powered wea pons are based.
“A radiation leak at Yokosuka would kill 100,000 people as far away as Tokyo, and could cause billions of dollars in damage，” said Masahiko Goto, leader of a protest group in Yokosuka. His group has collected more than 300,000 signatures of people across Japan opposed to the nuclear carrier.
The 44-year-old Kitty Hawk, the US Navy's oldest active ship, has been based in Yokosuka since 1998. It had returned to the US to be decommissioned in 2020. The new carrier, yet to be unveiled,_will travel faster, be capable of supporting longer operations and carry with it the Navy's most modern technology.
Experts pointed that this change is not only to strengthen the US-Japan military alliance but also to keep the military power of China and North
Korea within limits. However, even Japanese experts don't believe that the two countries are threats to the region.
“There is no need for Japan to have a nuclear carrier as defense，” said Tetsuo Maeda, an international relations professor at Tokyo International University. He said that the change of ship indicates an increased military capability in the region, much more than what is needed.
40．With such a formidable weapon to enter its country, Japanese citizens ________.
A．are aware of its benefits to the country
B．are anxious about its potential danger
C．are curious about the advanced technology
D．are against where the carrier will be based
41．The replacement of the aircraft carrier is intended to________.
A．set up a kind of base in Japan
B．strengthen the US-Japan military alliance
C．show Japan's greater military capability
D．get rid of the dated marine weapon
42.From the story, we learn that________.
A．no other countries except the USA and France possess aircraft carriers B．Japan has long planned to increase its military capability with new weapons
C．Japan will be the first country in Asia to have a nuclear aircraft carrier
D．Japan will be the third country to produce a nuclear-powered aircraft carrier
43．The underlined word “unveiled” in the fifth paragraph probably means________.
A．perfected B．discussed about
C．produced D．brought to view
C
China_is_going_green. In order to reduce air pollution and oil-shortages, automobile manufacturers have announced their plans to develop hybrid vehicles (混合燃料汽车) for the Chinese market. Toyota's hybrid car Prius will be ready to drive in China this week. Let's have a look at the new car.
Any vehicle is a hybrid when it combines two or more sources of power. Hybrid cars run off a rechargeable battery and gasoline. Hybrid cars have special engines, which are smaller than traditional gasoline engines. They run at 99 percent of their power when the car is cruising (匀速行驶). A specially designed battery motor provides extra power for running up hills or when extra acceleration is needed.
Step into a Prius, and turn on the engine. The first thing you notice is how much quieter it is than a traditional car. At this point, the car's gasoline engine is dormant (休眠). The electric motor will provide power until the car reaches about 24 km/h. If you stay at a low speed, you are effectively driving an electric car, with no gasoline being used, and no waste gas gives off.
The onboard(车载的) computer makes the decision about when to use a gas engine, when to go electric, and when to use a combination of the two. If you go over 24 km/h, when you step on the gas pedal (油门), you are actually telling the computer how fast you want to go.
The electronic motor recharges automatically using a set of batteries. When driving at high speed, the gasoline engine not only powers the car, but also charges the batteries. Any time you use the brake, the electric motor in the wheels will work like a generator and produce electricity to
recharge the batteries. As a consequence, the car's batteries will last for around 200,000 miles.
44．The author writes this passage mainly to________.
A．teach people how to drive a hybrid car
B．introduce a new kind of “green” car
C．show how to save their gasoline when driving a car
D．announce plans to develop hybrid vehicles for China
45．The first sentence probably refers to ________.
A．there will be more and more green land in China
B．China is still young and lacking experience
C．China's new cars are combinations of different green models
D．China has started producing environmentally friendly cars
46．Which of the followings is NOT true?
A．The hybrid cars reduce air pollution and oil-shortages.
B．The car's gasoline engine doesn't work until it reaches about 24 km/h.
C．This kind of car is completely controlled by an onboard computer.
D．A specially designed battery motor provides extra power when needed.
D
As civilization proceeds in the direction of technology, it passes the point of supplying all the basic essentials of life—food, shelter, clothes and warmth. Then we are faced with a choice between using technology to provide and fulfill needs which have now been regarded as unnecessary or, on the other hand, using technology to reduce the number of hours of work which a man must do in order to earn a given standard of living. In other words, we either raise our standard of living above that necessary for comfort and happiness or we leave it at this level and work shorter hours.
I shall take it for granted that mankind has, by that time, chosen the latter alternative. Men will be working shorter and shorter hours in their
paid employment. It follows that the housewife will also expect to be able to have more leisure in her life without lowering her standard of living. It also follows that human domestic servants will have completely ceased to exist. Yet the great majority of the housewives will wish to be relieved completely from the routine operations of the home such as scrubbing the floors or the bath of the cooker, or washing the clothes or washing up, or dusting or sweeping, or making beds.
By far the most logical step to relieve the housewife of routine is to provide a robot which can be trained to the requirements of a particular home and can be programmed to carry out half a dozen or more standard operations, when switched by the housewife.
47．As civilization develops in the direction of technology，________.
A．the basic essentials of life must be supplied
B．it is important to supply the basic essentials of life
C．it is no longer so important as it was in the past to supply all the basic essentials of life
D．it is not necessary to supply the basic essentials of life
48．According to the author, we are faced with________.
A．the choice of providing and fulfilling our needs
B．the choice of using technology
C．the choice of earning a standard of living
D．a choice between using technology to provide and fulfill needs to reduce the number of working hours
49．What alternative will mankind have chosen in future?
A．To leave our standard of living at this level and work shorter hours.
B．To raise our standard of living.
C．To fulfill needs which have been regarded as unnecessary.
D．To lower our standard of living and work shorter hours.
50．Now most housewives wish to________.
A．stop doing their housework
B．do more housework to improve their life
C．get rid of the heavy burden of their housework
D．do only simple and light housework
第二节(共5小题；每小题2分，满分10分)
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
In a national spelling contest in America, an 11-year-old girl was asked to spell a certain word. But with her soft voice the judges were not sure if she spelled the word with the letter A or E. __51__ At that time, the girl knew she had misspelled the word. But instead of lying and telling the judges she had said the correct letter, she told the truth that she had said the wrong letter. __52__
As the girl walked off the stage, the entire audience stood on their feet clapping to applaud her honesty. Later, dozens of newspaper reporters wrote about this 11-year-old girl's courage and honesty, even when it cost her the contest. __53__
Probably the biggest test of our character and honesty is what we would do if we knew we would never get caught.
This young girl could easily have lied, and nobody would have known it but her. But that's just it: She would know she did wrong. __54__ This young girl was strong and smart enough to prize her own conscience and character more than the prize from a spelling contest. Her respect for herself was more important than any respect others might give her for winning a contest. She knew she would have to live with herself and the choice she made at the moment.
__55__
A．So she won the contest.
B．As a result, she lost the contest.
C．The judges wanted to give her another chance.
D．It's been said, “If you cheat, you make yourself cheap.”
E．It's so true that the choices you make today make what you are tomorrow.
F．They talked it over and finally decided to simply ask her what she had said.
G．But the fact is that she won the biggest contest that day: the contest of her character.
第三部分写作(共两节，满分35分)
第一节短文改错(共10小题；每小题1分，满分10分)
假如英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除：把多余的词用斜线(﹨)划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；
2.只允许修改10处，多者(从第11处起)不计分。
Do you read reviews after you see a movie? I used to do that, but I usually wished I didn't. I used to read so much about a movie on advance that often I ended up not go to see it at all. The writers point everything out that is wrong with the film, and seldom mentions anything good about one. They also tell us the important things and even the ending of the movie. Lately
I have changed way I choose movies to look. Now I never read reviews before
a movie. I read them afterwards, if necessary. I don't watch the talk shows which people discuss movies.And I don't ask other people how they like of
it. Now, I enjoy myself even more.
第二节书面表达(满分25分)
假如你是李华。你的美国笔友Mike即将随其父母来中国，并在中国度过中秋节。他来信向你询问有关中秋节的习俗，请你根据以下要点写信告诉他。
要点如下：
1．历史悠久。
2．中国人独有的传统节日。
3．家庭团圆。
4．共进晚餐。
5．吃月饼。
6．赏月。
要求：1.词数100左右。
2．可适当添加细节。
3．开头已给出，不计入总词数。
高考资源网 Mike，
I'm glad to know that you are coming to China with your parents and spend the Mid-Autumn Day here. _______________________________________________________________________ _
___________________________________________________________________ _____
___________________________________________________________________ _____
综合能力训练卷(六)
第一部分
第一节
1．A 考查名词辨析。句意：所有相关的组织都迫切恳求政府，寻求额外的资金。appeal意为“呼吁；恳求”；符合句意。reply回复；consultation咨询；contract 合同，契约。
2．D 考查动词辨析。句意：我父亲每月给我五百元，我认为足以支付我所有的费用。cover意为“足以支付、够付”，符合语境。meet虽有“支付”之意，但没有足够之意，故不能选；contain包含；include列入，包含。
3．A 考查动词短语辨析。句意：当一种新的疾病爆发时，专家必须尽快弄明白做什么。figure out弄明白，符合句意。take out取出，除去，扣除；point out 指出；make out理解，辨认。
4．B 考查动词短语辨析。句意：多么遗憾呀！我错过了去机场接朋友，因为我的车子因交通拥挤耽搁了。hold up意为“拦住，耽搁”，符合语境。break up 破裂，解散；keep back保留，隐瞒；keep up保持。
5．D 考查介词短语辨析。句意：失业人数在增加。因此，许多年轻人发现他们失去了工作。as a result结果，因此；符合句意。in case免得，以防；all in all总的来说，大体而言；in particular尤其，特别。
6．B 考查动词短语辨析。句意：很明显，在人背后说东道西是每个人都难以容忍的。put up with忍受；符合句意。come up with提出，想出；keep up with 跟上；catch up with赶上。
7．A 考查动词辨析。句意：政府呼吁国家多注意甲型H1N1流感。appeal意为“呼吁”，符合句意。suggest建议；call叫，喊；explain解释。
8．B 考查介词短语辨析。句意：我们的英语老师是我们最喜欢的人。她善良且幽默，但是另一方面，她对我们很严格。由but可知，这里是说相反的方面，on the other hand(另一方面)有此用法，故选B项。in other words(换句话说)一般是对前文进行解释说明；after all毕竟；in all(总共，合计)作总结时使用。
9．D 考查动词短语辨析。句意：铃声响了，每个学生不得不上交他们的试卷。
give in意为“上交，递交”，符合语境。give up放弃；give away赠送，泄露；give out分发，耗尽。
10．A 考查动词辨析。句意：他为国家的牺牲从未得到官方的承认，这使得我们所有的人感到心灰意冷。acknowledge承认；appeal呼吁；recommend推荐；evaluate评价。
11．A 考查冠词用法。lead/live a/an…life是固定搭配，如lead an easy life过闲适的生活。第二个空特指贫困线，应用 the。故选A项。
12．A 考查动词短语辨析。句意：当他在网上查信息时，计算机系统突然出故障了。break down意为“(机器等)坏掉，出故障”，符合语境。
13．B 考查动词辨析。句意：为了跟上时代，我们必须使自己了解当前的新闻。这四个词都可以与of搭配， warn sb. of sth.警告某人某事；inform sb. of sth.通知某人某事；convince sb. of sth.说服某人相信某事；accuse sb. of sth.指控某人某事。
14.A 考查名词辨析。本句指的是这些树所形成的阴凉，故用shade，和下文的the cool air吻合。shadow指阴影。
15．A 考查动词辨析。句意：“或许我们应该放弃。”“形势的变化谁也无法预测。”predict意为“预言，预测”，符合句意。present意为“赠送”；prepare 意为“准备”；prefer意为“更喜欢”；均不合题意。
第二节
本文主要讲述了孩子的老师让孩子表达对父母的爱，作者了解了老师的意图后，也对儿子表达了对他的爱，这样做让作者感觉很好。
16．B 此处考查原词复现，由第二段的“… tell our pa rents we love them …”可知孩子应该是说“我爱你！”
17．C 由后文作者与儿子的对话及第三段作者致电给老师“…about what my son said and how the other parents had reacted…”可知作者一时不知道(know)说什么好。
18．C 由常识可知，孩子比大人矮且与前面的look up相对，因此作者应该
是俯视着(look down)儿子。
19．A “我”的第一个想法(thought)是……
20．A 此处应该表肯定的推测，故选A项。
21．D 衔接前文，此处作者应该是问儿子都是一些关于(about)什么的作业。
22．D 此处是指看(see)父母的反应。
23．C 作者打电话给老师是为了弄清楚(find out)儿子所说的话及其他父母的反应。
24．A the same … as…为固定搭配。句意：大部分父亲作出了和你一样的反应。
25．D we try this用了虚拟语气，只有D项有此用法。
26．D 此处宾语从句中少宾语，故选D项。
27．A 由thought可知后需接过去式，再由句意可知此处应该是表示“父母会(would)说什么”，构成过去将来时，而不是指能力，故不选C项。
28．A 老师应该是对此事作出解释，故选A项。
29．C 由最后一段最后一句中的“…of us healthier…”可知此处应该是说是“健康的重要组成部分”。
30．C 一个男孩应该(should)告诉父母他爱他们。
31．B 由语境可知，有时要说出“我爱你”是很难的(difficult)。
32．D 儿子应该是朝“我”走来(came)。
33．A 此处应该与以前相比，“我”额外(extra)多花了时间抱住他。
34．B 此处是对儿子头一天说的“I love you”作出回应，故说“我也爱你”。A项常用在否定句中，C项通常放在句中。
35．B 由全文知道，此处指父亲和儿子两者都，故选B项。
第二部分
第一节
A
36．C 细节理解题。由第二段“…an infrared scanner measured the heat emitted by crops.The data were transformed into a colour-coded map showing
where plants were running ‘fevers’．”可知，植物在发“高烧”，也就是说，植物在“身体状况”不佳时才会散发热。
37．D 推理判断题。由第二段末尾“…showing where plants were running ‘fevers’．Farmers could then spot-spray，…”可知，用红外线扫描的目的是确定有问题的区域，以使农民有针对性地喷洒杀虫剂。
38．A 细节理解题。由第二段最后一句“Farmers could then spot-spray, using 50 to 70 percent less pesticide than they otherwise would(采取点喷，农民们可以节省平时用量的50%至70%的杀虫剂)”可知。
39．C 细节理解题。由第三段的第一句“The bad news is that Paley's company closed down in 1984，after only three years.Farmers resisted the new technology and long-term backers were hard to find.”可知，红外线扫描技术应用于农业遇到了一些问题，原因有两个：一是农民对新技术的抵制；二是难以找到长期的赞助商。还有一处明显的提示出现在文章的最后一句“But only if Paley finds the financial backing which he failed to obtain 10 years ago”，从该句提供的信息同样可以反推出10年前的情形。
B
40．B 细节理解题。由第三段“Japan is the only world country to have been attacked by a nuclear weapon. Therefore, the citizens are highly sensitive to where nuclear-powered weapons are based.”及第四段可知B项正确。
41．B 细节理解题。由第二段的内容可知。
42．C 推理判断题。由第一段及第三段第一句话“It will be the first time that a nuclear-powered carrier is based in Japan.”可知。
43．D 词义猜测题。根据上下文提供的语境可推测，unveil意为“揭开面纱，使得……显露出来”。
C
44．B 主旨大意题。通读全文可知，作者想要介绍一种新型环保的汽车。
45．D 句意理解题。通过阅读第一段可以知道，中国现在对环境问题非常重
视，通过生产环保型汽车改善环境。故选D。
46．C 推理判断题。由第二、三、四段可得出答案。
D
47．C 细节理解题。由第一段的第一句“…it passes the point of supplying all the basic essentials…”可知选C。
48．D 细节理解题。由文章第一段第二句可知。
49．A 推理判断题。从第一段最后一句和第二段第一句判断，人类所选择的是使我们的生活水准停留在这种水平上并且使工时缩短。
50．C 细节理解题。由第二段第三句“这就意味着家庭主妇也将有望在生活中能有更多的闲暇，而又不至于降低她们的生活水准”可知选C。
第二节
51－55 FBGDE
第三部分
第一节
Do you read reviews afte r
before
you see a movie? I used to do that, but I
usually wished I didn't
hadn't . I used to read so much about a movie on
in
advance
that often I ended up not g o
going
to see it at all. The writers point everything
out that is wrong with the film, and seldom mention s
mention
anything good about
one
it
. They also tell us the important things and even the ending of the movie.
Lately I have changed∧
the way I choose movies to look
watch/see
. Now I never read reviews
before a movie. I read them afterwards, if necessary. I don't watch the talk shows which
where
people discuss movies.And I don't ask other people how they like
第二节
One possible version：
高考资源网_Mike,_
I'm_glad_to_know_that_you_are_coming_to_China_with_your_parents_and
_spend_the_Mid-Autumn_Day_here.
The Mid-Autumn Day is a traditional festival with a long history which is celebrated only by Chinese people. It falls on August 15th of the Chinese lunar year, when people of a family get together and enjoy the dinner together. After that they eat mooncakes, which stands for the spirit of the festival—unity.Often, if the weather permits, they will go out of the house to enjoy the bright moonlight, talking about something pleasant. It is one of the most important festivals for Chinese people.
I wish you a pleasant journey and I'm sure you will like our traditional Mid-Autumn Day.
Yours,
Li Hua