洛阳市2018届高三下学期尖子生第二次联考英语试题(含答案)(2018.04)

2018年河南省六市高三第二次联考试题英语试题参考答案听力理解 1—5 ABCBB 6—10 CABCC 11—15 BAABB 16—20 CAACC阅读理解 21—23 BCA 24—27 CBDD 28—31 BCCA 32—35 ADBA 36—40 CEBFG完形填空 41—45 DCABD 46—50 CABCA 51—55 CDDBA 56—60 BADCB 语法填空61. dependence 62. will start 63. including 64. which65. impractical66. the 67. is believed 68. countries 69. to use70. from短文改错书面表达Dear Charlie ，How is everything going? I feel greatly honored to inform you of the thrilling news that I am going to participate in the English speech contest, the theme of which is “What should I Do to Ensure a Cleaner Wo rld? ”As scheduled, the speech contest will be held on April 30th in the lecture hall of our school. As we know, it is of great necessity to attach great importance to protecting our environment, for it is to us human beings what water is to fish. Therefore, not only will this activity provide us with the chance to improve our speaking skill, but it will also raise our awareness of environmental protection.But now I still have some difficulty in using proper English to express my thoughts. I would appreciate it if you could share your suggestions concerning it.Looking forward to your early reply.Yours,Li Hua。

洛阳市2017——2018学年下学期尖子生第二次联考高三理科综合试题一、选择题：本题共13小题，每小题6分，在每小题给出的四个选项中，只有一项是符合题目要求的。

1.下列关于蛋白质的叙述，正确的是A.细胞间的信息交流均离不开细胞膜上的糖蛋白B.检测氨基酸的含量可用双缩脲试剂进行显色C肝细胞膜上有协助胰岛素跨膜转运的载体D.噬菌体的蛋白质一定是在核糖体上合成的2.对下列生命现象及其生物学意义的表述，正确的是A.主动运输使膜内外物质浓度趋于一致，维持了细胞的正常代谢B.光合作用推动碳循环过程，促进了生物群落里的物质循环C细胞分裂使细胞趋向专门化，提高了机体生理功能的效率D细跑凋亡使细胞被动有序死亡，有利于生物体内部环境的稳定3.大多数生物翻译的起始密码子为AUG或GUG。

如图所示的某mRNA部分序列中，若下划线“0”表示的是一个决定谷氨酸的密码子，则该mRNA的起始密码子可能是A.1B.2C.3D.44.某课题组为研究生长素和赤霉素对不同品系遗传性生豌豆生长的影响，进行了相关实验，结果如右图。

据图分析，下列叙述正确的是A.该实验结果表明生长素的作用具有两重性B.赤霉素对生长速率低的豌豆作用更显著C.赤霉素通过促进生长素的合成来促进生长D.不同品系豌豆自身合成赤霉素的量都相同5.人体免疫学的应用，一般有下图所获免疫的方法，下列叙述中正确的是A方法①比方法②获得的免疫力更持久B.方法②获得免疫力的过程属于细胞免疫C.皮肤被锈钉扎伤后，采用方法②防治破伤风D在临床医学上，通过方法②可进行免疫预防6.下列有关生物变异和育种的叙述中，错误的是A.减数分裂联会时的交叉互换实现了染色体上等位基因的重新组合B.有丝分裂过程中，姐妹染色单体上携带等位基因是基因突变导致的C.二倍体西瓜和四倍体西瓜是不同物种，但能通过有性杂交产生后代D.三倍体西瓜出现种子，可能是该植株经过减效分裂形成了正常的卵细胞7.《茶疏》中对泡茶过程有如下记载：“治壶、投茶、出浴、淋壶、烫杯、酾茶、品茶……”。

2018年河南省六市高三第二次联考英语注意事项：1•签君前，考生务必将自己的姓名、准考证号挨写在答题卡上。

2•回答选择题时，选出每小題答案后，用铅笔把答题卡上对应题目的答案标号涂黑. 如窝改动用橡皮擦干净后，再选涂其他答黄标号。

回答非选择题时，将竿案写崔答题卡上，写在试卷上无效。

3-考试结束后，将本试#和答题卡一并交回。

第一部分听力（共两节，满分30分）做题时，先将答案标在试卷上，录音内容结束启,你将有两分钟的时间将试卷上的答案转涂到答题卡上。

第一节（共5小题;每小题1. 5分，满分7.5分）请听下面5段对话。

每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

在听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1.What does the woman want to have for lunch?A.Fruit.B. Bread.C. Noodles.2.What is Jimmy doing?A.Shopping online.B. Walking the dog.C. Doing his homework.3.Why can Louise speak English well?A.She is an American.B.She likes English very much.C・ She once lived abroad for a long time.4.What is the woman going to do?A.Buy a new cellphone.e the phone on the table.C.Lend her phone to the man.5.How much does it probably take to get to California by bus?A.$25.B. $50.C. $100.第二节（共15小题;每小题1. 5分，满分22. 5分）听下面5段对话或独白。

第一部分听力(共两节，满分30分)做题时先将答案标在试卷上, 录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。

第一节(共5小题;每小题1. 5分, 满分7. 5分)听下面5 段对话。

每段对话后有一个小题, 从题中所给的A、B、C三个选项中选出最佳选项, 并标在试卷的相应位置。

听完每段对话后，你都有10 秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1. Why is the woman going to the post office?A. To mail a parcel.B. To buy her lunch.C. To find a building.2. How does the woman feel about her weekend?A. Very pleased.B. Somewhat bored.C. Extremely disappointed.3. What does the man want to buy?A. A bike.B. A lock.C. A camera.4. What does the man think is the best way of inviting guests?A. In person.B. By mail.C. Online.5. What is the woman concerned about the most?A. Spending less money.B. Buying unusual flowers.C. Getting something conveniently.第二节(共15小题;每小题1. 5分，满分22. 5分)听下面5 段对话或独白，每段对话或独白后有几个小题，从题中所给的A、B、C 三个选项中选出最佳选项，并标在试卷的相应位置。

听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟;听完后，各小题将给出5 秒钟的作答时间。

河南省洛阳市【英语高考】高三下学期尖子生第二次联考英语试题第I卷第一部分听力(共两节,满分30分)做题时，先将答案标在试卷上。

录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。

第一节（共5小题;每小题1.5分,满分7.5分）听下面5段对话。

每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1. When will Cold Feet start to be shown?A. Thursday.B. Friday.C. Saturday.2. Where is the man going?A. The shoemaker’s.B. The baker’s.C. The chemist’s.3. What is the man most probably?A. A lecturer.B. A writer.C. An athlete.4. What can we infer about the man from the dialogue?A. He’ll stop smoking.B. He doesn’t like smoking.C. He can hardly quit smoking.5. Where are the speakers?A. At a restaurant.B. In the library.C. In the kitchen.第二节（共l5小题;每小题l.5分,满分22.5分）听下面5段对话或独白。

每段対话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟;听完后，各小题将给出5秒钟的作答时间。

每段对话或独白读两遍。

听第6段材料，回答第6至8题。

河南省洛阳市2018届高三下学期尖子生第二次联考数学试题（理）第I 卷一、选择题1.若复数z 满足|3|z )1(i i +-=-，则z 在复平面内的对应的点位于 （ ）A.第一象限B. 第二象限C. 第三象限D. 第四象限2.已知集合 M = {3),1(log |y 21≥+=x x y }，N = {032|x 2≤-+x x } ,则M N =（ ）A. [-3,1)B. (-2,1)C. (-3,-2)D. (-2,3)3. 下列命题中，为真命题的是（ ）A. 0,x 00≤∈∃x eR B. 2＞2,x R x x ∈∀ C. ),(2sin 1sin Z k k x xx ∈≠≥+π D. 01-,2≥+∈∀x x R x 4. 已知某四棱锥的三视图如图所示，则该四棱锥的体积是（ ）A. 328B. 33C. 334 D. 3 5.在△ABC 的内角A ,B ,C 的对边分别为a ,b ,c ,已知22=a ，C B A sin 2sin ,43cos ==, 则△ABC 的面积是（ ） A. 47 B. 7 C. 516 D. 58 6. 在区间[0,2π]上任选两个数x 和y ，则y <x sin 的概率为（ ） A. 24π B. 221π- C. 22π D. 241π-7.从1，3,5,7,9这五个数中，每次取出两个不同的数，记为共可得到s t lg lg -的不同值的个数记作m .若函数)2cos()2sin()(βπαπ+++=x b x a x f 满足m f =)0(，则)2(f 的值为（ ） A. -15 B. -16 C. -17 D. -188. 设变量y x ,满足约束条件，⎪⎩⎪⎨⎧≤+≥+-≥+03-20302y x y x x ，则目标函数y x 6z +=的最大值为（ ）A. 3B. 4C. 18D. 409.若正整数N 除以正整数m 后的余数为n ，则记为)(mod N m n ≡，例如)6(mod 538≡.执行如图所示的程序框图，则输出的结果为（ ）A.2019B.2023C.2031D.204710.若a >b >1，-1 < c < 0，则（ ）A.c c ba<abB. c c b >aC.|c |log |<|log b c aD.|c |alog > ||log b c b a11.已知双曲线12222=-by a x (b >a >0)的两条渐近线为1l 、2l ，过右焦点P 作垂直于 1l 的直线,分别交于1l 、2l 于A ，B 两点.若|OA |，|AB |，|OB |成等差数列，则双曲线的离心率为（ ） A. 5 B. 25 C. 3 D. 13+ 12.已知函数)(e )(2R a ax x f x ∈+=，若曲线)(x f y =在点 P ))(,(x f m ， (m > 1) 处的切线为l ，且直线l 在y 轴上的截距小于1，则实数a 的取值范围是（ ） A. (21-,+∞) B. [-1, +∞) C. [21-,+∞) D.(-1,21-) 第Ⅱ卷二、填空题13.在(12)2x (+的展开式中，5x 项的系数为____________.14.若互相垂直的两向量,，满足|||λ=+，且+与-的夹角为060， 则实数λ的值为 .15.已知抛物线px y 22= (p >0)的焦点为F ，其准线与双曲线1322=-x y 相交于M ，N 两点，若MF 丄NF ,则p = .16.在△ABC 中，角 A ，B ，C 的对边分别为a ，b ，c ，若12t a n t a n -=bc B A ，且 sin(B + C )=6cos B sin C ，则cb 的值为 . 三、解答题17. 设等差数列{a n }的前n 项和为S n ，且S n =4S 2，a 2n = 2 a n + 1 .(1)求数列{a n }的通项公式；(2)若数列{b n }满足）1(25b 1++=+n n a n n n ，求数列{b n }的前n 项和T n .18. 某市共有户籍人口约400万，其中老人(60岁及以上）约66万,为了解老人们的身体 健康状况，相关部门从这些老人中随机抽取600人进行健康评估.健康状况共分为不能自 理、不健康尚能自理、基本健康、健康四个等级，并以80岁为界限分成两个群体进行统计， 由样本数据制得如下条形图.(1)根据条形图完成下表：并估算该市80岁及以上老人占全市户籍人口的百分比；(2)据统计，该市大约有五分之一的户籍老人无固定收入，该市政府计划给这部分老人每月发放生活补贴，标准如下：①80岁及以上老人每人每月发放生活补贴200元,②80岁以下老人每人每月发放生活补贴120元；③不能自理的老人每人每月额外发放生活补贴100元，试估算该市政府为执行此计划每年所需资金的总额(单位:亿元，保留两位小数）19. 如图，等边△ABC 的边长为3,点D ，E 分别是AB ，AC 上的点，且满足21EA CE DB AD == (如图1).将△ADE 沿DE 折起到△A 1DE 的位置，使二面角A 2-DE -B 成直二面角，连接(如图2).（1）求证:A 1D 丄平面BCED ；（2）在线段BC 上是否存在点P ，使直线P A 1与平面A 1BD 所成的角为60°?若存在， 求出PB 的长；若不存在，请说明理由.20. 已知椭圆C : 12222=+by a x (a >b >0)的离心率为22，过右焦点F 且与长轴垂直的直 线被椭圆截得的线段长为2，0为坐标原点.(1)求椭圆C 的标准方程；(2)设经过点M (0,2)作直线l 交椭圆C 于A 、B 两点，求△AOB 面积的最大值及相应的直线l 的方程.21. 已知函数bx ae x f x+=)(,曲线)(x f y =在点(1，)1(f )处的切线方程为)1(4+=x e y . (1)求a ,b 的值；(2)证明：当:x >0 且1≠x 时，xx x f ln 1>)(-.选考部分:请考生在22、23两题中任选一题作答，如果多做，则按所做的第一题记分.22.[选修4-4,坐标系与参数方程]在直角坐标系: xOy 中，以O 为极点—轴的非负半轴为极轴建立极坐标系，已知曲线 C 1的极坐标方程为4sin =θρ,曲线C 2的极坐标方程01sin 4cos 22=+--θρθρρ,曲线C 3的极坐标方程为），（R 4ρπθ=. （1）求C 1与C 2的直角坐标方程；（2）若C 2与Q 交于P 点，C 2与C 3交于A ， B 两点，求△P AB 的面积.23.[选修4 — 5:不等式选讲]已知 a >0，b >0，c > 0,函数c |2b -x ||a x |)(+++=x f 的最小值为 4.(1)求a +2b + c 的值；(2)证明：13849222≥++c b a .【参考答案】。

2018届高中毕业班第二次统一检测题英语科参考答案第二部分阅读理解（共两节，满分40分）第一节：阅读理解21-23 ADD 24-27 BBDC 28-31 DDBA 32-35CADC第二节（七选五）36-40 GACEB第三部分英语知识运用（共两节，满分45分）第一节完型填空（共20小题；每小题1.5分，满分30分）41—45 BDCAD 46—50 BACBB 51—55 ACDDC 56—60 BBCDC第二节语法填空（共10小题；每小题1.5分，满分15分）61.the 62.living 63.which 64. lower 65. was covered66.off 67. was 68. endlessly 69. took 70. abilities第四部分写作(共两节，满分35分)第一节：短文改错（每小题1分；满分10分）：Mr. Black is my favorite teacher, which is 1.7 meters in height. Before graduatingwho Afterfrom college, he became the senior high school teacher. Since then, he ∧taught math for a fewa hasdecade. It's said that he will retire early from his position next year owing to poorly health decades poor conditions. During his teaching years, he not only can make his students to learn well, but also iswell-known for her unique teaching methods of how to effectively inspire students' enthusiasm.hisI didn’t like math a year ago. For me, it seemed bored and difficult. He was the only teacher thatboringusually helps me with patience. Now I'm good at math.helped第二节书面表达（满分25分）【答案】Dear Mr and Mrs Brown,I am Li Hua, your new neighbor and an exchange student in a Britain high school. I’m writing to extend my warm welcome and give a brief introduction of the community.Located in downtown, our community has not only convenient transportation but also well-developed modern facilities. With a park and a library surrounding, it’s really a good place to relax and improve yourself. What’s more, people here are friendly and hospitable which always makes the life here happy and comfortable.In order to help you know better of the things here, we are going to hold a party at our community center at 5 p.m. this Sunday. I sincerely hope you can come and have a good time.Looking forward to your reply.Yours,Li Hua第二节：一、评分原则1．本题总分为25分，按5个档次给分。

第I卷第一部分阅读理解（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，并在答题卡上将该项涂黑。

AMy doorbell rings at 11 a.m. On the step, I find an elderly Chinese lady. She is small and slight. She holds a paper carrier bag in her hands.I know this lady. It is by no means her first visit. Her daughter, Nicole, bought the house next door last October. Nicole, who is currently in Shanghai, has apparently told her mother that I am having heart surgery shortly, and the result is that her mother has decided I need to be supplied with meals.I know what is inside the paper carrier bag — a stainless-steel container with a meal of rice, vegetables and either chicken, meat or shrimp. This has become an almost-daily occurrence.Communication between my benefactor (恩人)and me is somewhat handicapped by the fact that she doesn’t speak English and all I can say in Mandarin is “hello”. Once, she brought an iPad and pointed to the screen, which displayed a message from Nicole telling me that her mother wanted to know if the food was all right.“Your mother just can’t be bringing me meals like this all the time” I protested. “I can hardly reciprocate by cooking something from my native land, like roast beef or Yorkshire pudding for her” I said.“Oh，no,” Nicole said. “Don’t worry about that. She has to cook for the family anyway, and she wants to do it for you. You can call her Wing, which is her surname.”The tenant in my basement suite is a university student who speaks Mandarin quite well, so with her help, I have found out that Wing is 68—13 years younger than I am — and that she lived through the Cultural Revolution. For my part, I was raised in wartime Britain.So here we are, two grandmothers a world away from where we were raised, neither of usable to speak the other’s language. But the doorbell keeps ringing and there is the familiar paper earner bag, handed smilingly to me by Wing.Right now I am working on some more Mandarin words—it’s the least I can do after such a display of kindness.“Thank you” is, of course，the first one, which somehow seems inadequate.1. The author and Wing got to know each other .A. as next door neighborsB. when exchanging mealsC. by sharing similar experiencesD. after using an iPad to communicate2. The underlined word “reciprocate” in Paragraph 5 probably means.A. do as wellB. offer generouslyC. give in returnD. accept with pleasure3. The author’s effort to learn Mandarin shows her .A. great satisfactionB. real kindnessC. heartfelt thanksD. sincere friendshipBIt’s not what you look at that matters; it’s what you see.——Henry David Thoreau Slow Art Day is a global event with a simple mission: help more people discover for themselves the joy of looking at and loving art.Why slow?When people look slowly at a piece of art，they make discoveries. The most important discovery they make is that they can see and experience art without an expert. And that’s an exciting discovery. It unlocks passion and creativity and helps to create more art lovers.How does it work?One day each year, people all over the world visit local museums and galleries to look at art slowly. Participants look at five works of art for 10 minutes each and then meet together over lunch to talk about their experience. That^ it. Simple by design, the goal is to focus on the art. In fact, Slow Art Day works quite well this way.By the numbersOver 1,200 individual Slow Art Day events have taken place since its official launch in 2018. Slow Art Day events have taken place on all seven continents.700 venues (museums, galleries, artist studios, sculpture parks, public art sites, etc.) have hosted Slow Art Day events.Participants love Slow Art DayFeedback on this simple event has been overwhelmingly positive. Here’s a sample:“I loved taking the time to just ‘be’ with the works, particularly pieces I might otherwise walk by. It’s a much better way of doing the art museum than the usual idle ramble. Discussion afterwards was fun，interesting, informative and eye-opening. I look forward to doing it again.”Slow Art Day 2018 is Saturday, April 8, in museums and galleries worldwide. Join us and experience art differently.4. The author quotes Thoreau’s words at the beginning to.A. arouse readers’ interest in artB. introduce the topic of the textC. stress the importance of lookingD. illustrate the joy of art appreciation5. A typical slow art activity .A. lasts about fifty minutes when people look at art works criticallyB. encourages people to see art for themselves and discuss with expertsC. organizes people to look at art on their own and talk about their experienceD. inspires people to make discoveries about art works and create their own6. What can we learn about Slow Art Day from the text?A. The year of 2018 will see the eighth Slow Art Day.B. It happens once a year in all museums and galleries worldwide.C. It has become an art festival celebrated on all seven continents.D. Slow Art Day events have been held in over 1,200 different places.7. According to the text, the author .A. has conducted a survey on Slow Art DayB. strongly recommends Slow Art Day eventsC. sees the good and bad sides of Slow Art DayD. is frequently involved in Slow Art Day eventsCGot big plans for Friday night? That’s OK, we don’t either.Guess we’ll all have to make do by watching the celestial (天空的)show that will take place that night.First, there will be a full moon. That’s always fun, but this one will be a little m ore special. It’s known as a “snow moon.” The name comes from the fact that the heaviest snows usually fall during February, according to the Old Farmer’s Almanac.But if that’s not special enough, there’s also an eclipse (月食)that night. It’ll be a penumbr al lunar eclipse, meaning ifs a partial eclipse that leaves sections of the moon darkened by the earth’s shadow. No, it won’t be as spectacular as those “blood moon” eclipses. It’ll be subtler. The level of darkness it reached during the eclipse may or may not be apparent; it just depends on where you are when you view it.In North America, the eclipse begins at 5:34 p.m. ET and ends at 9:53 p.m. ET, according to astronomy website EarthSky. The eclipse will be at its height around 7:44 p.m. ET.If that’s still not enough, let’s throw in a comet (彗星)to the night’s festivities.Comet 45P (it has a much longer name, but we won’t burden you with it here) is visible as it flies by Earth. The comet will get within 7.4 million miles of the planet as it makes its closest approach this weekend, according to Universe Today.Comet 45P will be the most visible a couple of hours after the eclipse, so look to the skies again around 3 a.m. ET Saturday and find the greenish-blue light with a tail.And don’t forget, a total big-time solar eclipse will streak across the United States on August 21st.8. According to the text, what can be viewed on Friday night?A. A blood moon.B. A total solar eclipse.C. A partial lunar eclipse.D. A comet without a tail.9. If you want to see Comet 45P, you will need to .A. wait around 7:44 p.m. ETB. stay up until 9:53 p.m. ETC. wake up before 3:00 a.m. ETD. start watching at 5:34 p.m. ET10. The author writes the text with the purpose of .A. introducing basic astronomy to the mediaB sharing new discoveries with astronomy researchersC promoting astronomical events among science scentsD informing average readers of recent celestial phenomena11. Which can be a suitable title for the text?A Comet 45P will be visible as it approaches the earthB Penumbral lunar eclipse will happen on Friday nightC. Suggestions of fun scientific exhibitions for the coming weekendD. Eclipse, full moon, comet team up to put on a show on Friday nightDThe Super Bowl is the annual championship game of the National Football League (NFL). The game is the culmination (髙潮)to a season that begins in the late summer of the previous calendar year. Normally, Roman numerals are used to identify each game, father than the year in which it is held. For example, Super Bowl I was played on January 15, 1967, following the 1966 regular season. The single exception to this rule is Super Bowl 50, which was played on February 4, 2018, will follow the 2018 regular season.The game was created as part of a merger (合并)agreement between the NFL and its then-rival league, the American Football League (AFL). Currently, the Pittsburgh Steelers have the most Super Bowl victories, with six. The New England Patriots have the most Super Bowl appearances, with nine.The day (usually the first Sunday in February) on which the Super Bowl is played, now considered as an unofficial American national holiday, is called “Super Bowl Sunday”. It is the second-largest day for U.S. food consumption, after Thanksgiving Day. In addition, the seven most-watched broadcasts in U.S. television history are Super Bowls. In 2018, Super Bowl XLIX attracted an audience of 114.4 million.Because of the high viewership, commercial airtime during the Super Bowl broadcast is the most expensive of the year, leading to companies regularly developing their most expensive advertisements for this broadcast. As a result, watching and discussing the broadcast's commercials has become a significant aspect of the event. In addition, popular singers and musicians including Michael Jackson, Madonna, Prince, Beyonce, Paul McCartney, The Rolling Stones, The Who, Whitney Houston, and Lady Gaga have performed during the event's pre-game and halftime ceremonies.12. According to the text, in the Super Bowl .A. the New England Patriots have won nine timesB. the Pittsburgh Steelers have won six titlesC. Arabic numerals are used to refer to each gameD. winners of the last season play against each other13. On Super Bowl Sunday, American people usually .A. buy expensive Super Bowl ticketsB. consume the most food of the yearC. avoid the Super Bowl commercialsD. enjoy performances by famous artists14. In 2018, the Super Bowl was held.A. 46thB. 49 thC.51stD.55th15. We can know from the text that the Super Bowl .A. is a public holiday in the United StatesB. is the annual championship game of AFLC. launches a new season of the National Football League every yearD. has frequently been the most watched American television broadcast of the y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。