内容:
Supporters of gun control have worked for many years to ban the sale of ___ handg uns in America.
选项:
a、deadly
b、fatal
c、mortal
d、 lethal
题号:2 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
I have five free-lance writers under ___.
选项:
a、contact
b、 contract
c、concrete
d、contrast
题号:3 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
His being late ___ us much anxiety.
选项:
a、set off
b、caused
c、touched off
d、led to
内容:
___ travels more slowly than light.
选项:
a、Voice
b、Sound
c、Noise
d、Wave
题号:5 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
By moving the radar beam around slowly in a circle, we can ___the surroundings. 选项:
a、explore
b、expose
c、erploit
d、expand
题号:6 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
Clever advertisements are just ___to spend money.
选项:
a、temperature
b、tempo
c、tendency
d、temptation
题号:7 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
An exhibition of new inventions is ___ now.
选项:
a、being held
b、hold
c、to be held
d、holding
题号:8 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
A window in the kitchen was ___; there was rubbish everywhere ,and the curtains a nd carpets had been stolen.
选项:
a、scattered
b、scraped
c、scratched
d、smashed
题号:9 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
Those of us who are fifty years old should get ___blood pressure checked regularl y.
选项:
a、one's
b、 our
c、their
d、your
题号:10 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4 内容:
Please write to ___your reservation.
选项:
a、confirm
b、conform
c、contribute
d、firm
题号:11 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4 内容:
You should immediately ___, in person or by letter.
选项:
a、apply
b、request
c、seek
d、solicit
题号:12 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4 内容:
I have a 70-year-old patient with a ___ankle.
选项:
a、fracture
b、function
c、farther
d、funny
题号:13 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
Several horses escaped from the farm last night. It was a long time ___ the owner discovered what had happened.
选项:
a、before
b、Since
c、After
d、soon
题号:14 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
The doctor was asked to go back to the hospital because of ___case.
选项:
a、an operation
b、an emergency
c、treatment
d、an incident
题号:15 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
Their friendship ___ nothing to him.
选项:
a、means
b、represents
c、stands
d、presents
题号:16 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
Our chances of winning the game are ___.
选项:
a、slim
b、light
c、 slant
d、 slender
题号:17 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
Having been found guilty, the man was given a severe ___ by the judge.
选项:
a、service
b、sentence
c、crime
d、crisis
题号:18 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
___ receiving the gift, Einstein wrote a letter of thanks to the author immediate ly.
选项:
a、While
b、The moment
c、Since
d、On
题号:19 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
The court considers a financial ___to be an appropriate way of punishing him. 选项:
a、payment
b、obligation
c、option
d、penalty
题号:20 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
The current political ___ of our country is favourable for foreign investments. 选项:
a、climate
b、 weather
c、temperature
d、state
题号:21 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
Being ___ time and equipment, they are not able to finish their task in time. 选项:
a、shorted of
b、shorting
c、 short of
d、 short
题号:22 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
___his sister, Jack is quiet and does not easily make friends with others.
选项:
a、Dislike
b、Unlike
c、Alike
d、Liking
题号:23 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
Nowadays many species of animals are no longer___.
选项:
a、in common
b、exist
c、living
d、in existence
题号:24 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
When there are small children around, it is necessary to put bottle of pills out of___.
选项:
a、hand
b、reach
c、hold
d、place
题号:25 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:4
内容:
The ___responsibility for this job is yours. 选项:
a、only
b、single
c、sole
d、unique
2012大学英语第二次作业 第一部分：交际用语（共10小题；每小题3分，满分30分） 此部分共有5个未完成的对话，针对每个对话中未完成的部分有4个选项，请从A、B、 C、D四个选项中选出可以填入空白处的最佳选项 1. — Could I borrow your car for a few days? — 所选答案： C. Sure, here your are. Enjoy your journey. 问题 2 得 3 分，满分 3 分 2. — Thank you for inviting me. — ______________ 所选答案： C. Thank you for coming. 问题 3 得 3 分，满分 3 分 3. —May I see your tickets, please? — ______________ 所选答案： C. Sure. 问题 4 得 3 分，满分 3 分 4. — Please help yourself to the seafood. —__________ 所选答案： D. Thanks, but I don't like the seafood. 问题 5 得 3 分，满分 3 分 5. — Can you go to the concert with us this evening? —__________ 所选答案： B. I'd love to, but I'm busy tonight. 问题 6 得 3 分，满分 3 分 6. — Congratulations! Y ou won the first prize in today's speech contest. —__________ 所选答案： C. Thank you. 问题7 得0 分，满分 3 分 7．—I had a really good weekend at my uncle’s. — _______. 所选答案： C. It’s a pleasure 问题8 得 3 分，满分 3 分 8．— Susan, will you please go and empty that drawer? — _______? 所选答案： A. What for 问题9 得 3 分，满分 3 分 9— What do you want to do next? We have half an hour until the basketball game. — _________．Whatever you want to do is fine with me. 所选答案： B. It’s up to you 问题10 得 3 分，满分 3 分 10．— How about putting some pictures into the report? — ________ A picture is worth a thousand words.
大学英语（二）（第二版）2014年11月考前练习题 一完型填空 Passage 1 Each human being is born as something new， 1 that never existed before．He is born with 2 he needs to win at life．Each person in his own 3 can see，hear，touch，taste，and think 4 himself．Each has his own unique 5 —his capabilities and limitations． 6 can be a significant，7 ，aware，and creatively 8 person in his own right — a winner． The words “winner” and “loser” have many meanings．When we refer 9 a person as a winner，we do not mean one 10 beats the other guy 11 winning over him and 12 him lose．To us，a winner is one who responds authentically by being 13 ，trustworthy，responsive，and genuine，14 as an individual and as a member of a 15 ． A loser is one who fails to respond authentically．Martin Buber 16 this idea as he retells an old story of a rabbi who on his 17 bed sees himself as a loser．The rabbi laments that，in the world to come，he will not be asked why he wasn’t Moses；he will be asked why he wasn't 18 ． Few people are one hundred percent winners or one hundred percent losers．It's a 19 of degree．However，once a person is on the road to being a winner，his chances are greater for becoming even more 20 ．This book is intended to facilitate the journey．1．A．everything B．anything C．something D．thing 2．A．that B．what C．which D．how 3．A．way B．case C．method D．appetite 4．A．of B．to C．for D．about 5．A．possibilities B．abilities C．potentials D．energy 6．A．One B．All C．Every D．Each 7．A．thinking B．think C．thought D．have thought 8．A．produce B．productive C．product D．productivity 9．A．as B．to C．for D．on 10．A．what B．those C．which D．who 11．A．with B．for C．on D．by 12．A．making B．let C．letting D．make 13．A．credit B．believing C．credible D．believed 14．A．all B．both C．which D．each 15．A．society B．group C．community D．party 16．A．takes B．tells C．speaks D．expresses 17．A．die B．death C．dying D．died 18．A．his B．him C．himself D．self 19．A．matter B．case C．thing D．something 20．A．than B．much C．then D．so 附：参考答案 Passage 1
江南大学现代远程教育第二阶段测试 卷 考试科目:《大学英语（二）》（总分100 分） 时间：90分钟 ___ 学习中心（教学点） 批次： 层次： 专升本 专业： 学号： 身份证号： 姓名：得分： 一、交际英语 1、-- How is your father today? -- _____C_____, thanks. A：He is over forty B：He's a doctor C：He's much better D：He's Brown 2、--Will you please give the note to him? -- ______A_______. A：Certainly, I'll give it to him B：No, please not C：Sorry, I don't D：Yes, please do 3、--I was born in Boston, but I studied in New York.____B_____? --I was born in New York, but studied in Boston. A：What do you do B：And you C：Where were you D：Do you 4、--What does your father do? -- _____C______. A：He is cleaning the street
B：He is forty C：He is a farmer D：He is all right 5、-- _____C________? -- Do you have a toy horse? A：What do you want to sell B：Shall I help you C：What can I do for you D：Do you like a toy horse 二、阅读理解 1、 Tom arrived at the bus station quite early for Paris bus. The bus for Paris would not leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in line, others were walking around. There was a group of schoolgirls. Their teacher was trying to keep them in line. Tom looked around, but there was no place for him to sit. He walked into the station cafe. He looked up at the clock there. It was only twenty to twelve. He found a seat and sat down before a large mirror on the wall. Just then, Mike, one of Tom's workmates came in and sat with Tom. "What time is your bus?" asked Mike. "There's plenty of time yet" answered Tom. "Well, I'll get you some more tea then" said Mike. They talked while drinking. Then Tom looked at the clock again. "Oh! It's going backward" he cried. "A few minutes ago it was twenty to twelve, and now it's half past eleven." "You're looking at the clock in the mirror." said Mike. Tom was so sad. The next bus was not to leave for another hour. Since then Tom has never liked mirrors. (1)、Tom went into the station cafe because Mike asked him to have a cup of tea. ( B ) A：T B：F
题号:1 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:2 __________ each question, the teacher writes the correct answer and three other statements that look like correct ones. ?A、As to ?B、Except fo ?C、Along with ?D、In addition 标准答案：c 说明： 题号:9 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:2 The army has _____________ a successful attack on the anti-government organization. ?A、computerized ?B、achieved ?C、scheduled ?D、completed 标准答案：d 说明： 题号:2 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:2 __________ brought up and educated in Chicago, the author is most famous for his stories about New York City. ?A、Since ?B、As
?C、Although ?D、When 标准答案：c 说明： 题号:3 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:2 ____________ all the electronic devices, computers have the greatest significance in modern technology. ?A、On ?B、In ?C、with ?D、Of 标准答案：d 说明： 题号:4 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:2 If we compare the weather in Nanjing ___________ in London, we find there are many differences. ?A、with it ?B、with that ?C、and ?D、with 标准答案：b 说明： 题号:5 题型:单选题（请在以下几个选项中选择唯一正确答案）本题分数:2 It will not take more than five hours ____________ to Beijing by train by the end of the year.
江苏开放大学 形成性考核作业 学号 姓名 完成日期2018年4月16日 课程代码110004 课程名称大学英语A（专）评阅教师（教师填写） 得分（教师填写） 评阅时间2018年X月X日第 2 次任务 共 4 次任务
江苏开放大学大学英语（A）（专） 形成性考核 2 答题纸 I. 选择填空（每小题2分，共20 分） II. 用方框里所给的短语完成对话（每小题2分，共10分） III. 阅读理解（每小题2 分，共40 分） IV. 完成句子（每小题3 分，共30 分） 1.a foolish idea 2. we didn’t see anyone all day 3. any money on herself 4. deal with the problem 5. the weather conditions 6. is best known for 7. are different from each other 8.important for you to pass the exam 9.Will benefit from a free medical examination 10. apply for a job 教师评语：。
江苏开放大学大学英语（A）（专） 形成性考核 2 试题 I. Choose the choice that best fits into the blank.（每小题 2 分，共 20 分） 1. There ______ only a few eggs and there ______ not much milk left in the refrigerator. A. is, are B. is, is C. are, are D. are, is 2. Xiao Li ______ in this school since 2008. A. has been teaching B. has teaching C. taught D. teaches 3. The road is so slippery. It ______ . A. might snow soon B. must snow soon C. must have snowed D. may be snowing now 4. Li Ping got a new job and she ______. A. doesn’t work here no longer B. doesn’t work here any longer C. works here no longer D. works here any longer 5. – Do you know who he is? –He ______ familiar, but I’m not sure who he is. A. tastes B. feels C. smells D. looks 6. If the card ________, customers should report the loss as soon as possible A. has lost B. lost C. is lost D. loses 7. I use the short-wave radio to get the ________ financial news. A. last B. latter C. latest D. later 8. I was working part-time last Saturday, otherwise I _________ you in the football game. A. would like B. joined C. should join D. could have joined 9. Jack made a promise __________ he would return the money to me within three days. A. what B. when C. that D. which 10. As a rule, the employer paid the workers __________. A. by an hour B. by the hour C. by hour D. by hours II. Complete the dialogue with the expressions given in the box.（每小题2分，共10分） A. Why don’t you B. What about C. planning to D. I’m going to E. I will Hans: What are you 1 do after class? Mark: I’m going to play basketball. 2 you? Hans: Well, 3 stay in the classroom and do the homework. Mark: 4 take a break first? Hans: Maybe 5 , you know, go out for a walk. Mark: That’s better
江南大学现代远程教育第二阶段测试卷 考试科目:《大学英语（二）》时间： 90 分钟 专业：姓名：学习中心（教学点） 学号： 批次：层次： 身份证号： 得分： 第一部分：交际用语（共 5 小题；每小题 3 分，满分15 分） 此部分共有 5 个未完成的对话，针对每个对话中未完成的部分有4 个选项，请 从 A、B、C、D四个选项中 选出正确选项。 1． - Good morning, John . How are you doing? -____C_____ A ： I’m pleased. B ： Good night. C： Not so bad. And you? D ： How do you do? 2． - How do I get to the cinema? -_____D____ A ： It's very far. B ： Yes, there is a cinema near here. C： It's well known. D ： Go down this street and turn left. 3． - This is a challenging job. Who wants it? -_____A____ A ： I'll take it. B ： It's a good idea. C： You bet! D ： No sweat! 4． - I hope you have a most happy and prosperous new year! - _____C____ A ： You are welcome! B ： How smart you are! C： The same to you! D ： Nice going! 5． - Would you like to see a film? - ____A_____ A ： Yes, I'd love to.
大学英语 （2）第二次网络作业（新教材） 一、阅读： ( 1 ) One important cause of the generation gap is the opportunity that young people have to choose their own ways of life. In a more traditional society, when children grow up,they are expected to live in the same area as their parents,to marry people that their parents know and like, and often to continue the family jobs.In our society,young people often travel great distances for their education, move out of the family at an early age,marry or live with people whom their parents have never met,and choose jobs different from those of their parents. 1. The first paragraph tells us that __A__. a.the problem of the generation gap draws much attention from people 2. In a more traditional society, old people___A__. a. have their children respect and listen to them b. do not care for their children at all c. expect their children to rebel against them d. do not live together with their children 3. In American society young people___B___. a. do not need to find jobs b. leave home at an early age
大学英语（2） 一、单项选择题： 1．The bridge club _________ his application for membership. 答案:A.refused to consider 2．He jumped onto the train just as it was pulling ______. 答案: C.away 3．Unfortunately, very few sheep _________ the severe winter last 答案: A.survived 4．Don’t ________ to let me know if there is anything I can do for you. 答案: C.hesitate 5．Born into a rich family, he has no idea of ____ to be a poor man。 答案: B.what it’s like 6．Does it _______ a lot to have the recorder repaired? 答案: C.cost 7．It was said that Nancy was going to marry a rich man, but she _____ it. 答案: B.denied 8．They have developed techniques which are________ to those used in most factories. 答案: D.superior 9．The old couple decided to move out of town to a quiet _________ , where they had spent several years immediately after their marriage. 答案: B.suburb 10．I’ll have my long skirts shortened because they are _______ now. 答案: A.out of style 11．She can _____ sing well; she is also a good dancer. 答案: D.more than just 12．If I had ____ in business, I might be a very wealthy man today. 答案: C.stayed 13．While it may be more convenient to ______ a car, it is also expensive and troublesome at times. 答案: B.possess 14．It took Jane a whole hour to ________ this problem 答案: D.work out 15．It was because the applicant was too conceited _________ he failed in the interview. 答案: A.that 16．____ the past three years, he has been attending evening classes to study Japanese 。答案: B.For 17．You’ll cut yourself if you walk around in _______ feet. 答案: B.bare 18．Excuse me, but it is time to have your temperature __________. 答案: D.taken 19．The film is much better than the _______ we saw last Sunday. 答案: A.one
一、单项选择题。本大题共30个小题，每小题2.5 分，共75.0分。在每小题给出的选项中，只有一项是符合题目要求的。 1. —Would you like to go skating with me? —________________. ( C ) A.Yes, I think so B.No, thanks C.Yes, I'd love to D.I'm afraid not 2. —Would you like something to drink? What about a cup of tea? —________________( A ) A.No, thanks. B.No, I wouldn't. C.Yes, I want. D.Yes, I like. 3. —Hello, may I have an appointment with the headmaster? —________________.( C ) A.Sorry, I don't know you B.No, you can't C.Certainly. Wait a minute, please D.Let me see 4. —Why not join us in the game? —________________.( A ) A.OK! I'm coming B.No, you do the same C.Oh, that's all right D.Don't mention it 5. —Could I see your ticket please? —________________( D ) A.I am not sure yet. B.I'd love one. C.I might be. Why? D.Here you are. 6. —Do you think I could borrow your dictionary this weekend? —Sorry, but ________________ ( C ) A.you can not have it right away. B.I'm sure you'll like it. C.I'm going to need it myself. D.the dictionary is just there.
一、单项选择题。本大题共40个小题，每小题2.5 分，共100.0分。在每小题给出的选项中，只有一项是符合题目要求的。 1. —What a poor job I’ve done! —_______ 2. ( D ) 1. Do it again. 2. 3. You can do it. 4. 5. Do your best! 6. 7. Don’t be upset. No one can do it better than you. 8. 3. —Are you doing anything special on Friday, Bill? —_______ —Oh, what a pity! 4. ( B ) 1. No, nothing special 2. 3. Yes, I have promised to call on some friends 4. 5. Yes, of course 6. 7. No, I’m not sure. Why? 8. 1. —I’d like to make an appointment with Mr. White. —_______ 2. ( C ) 1.
Sorry, he is busy at the moment. 2. 3. Why didn’t you call earlier? 4. 5. Certainly. May I know your name? 6. 7. Sorry. He doesn’t want to see you. 8. 1. —This is the worst film ever produced. Do you think so? —_______ 2. ( B ) 1. You’re wrong 2. 3. I don’t think so, I’m afraid 4. 5. Not at all 6. 7. No, that’s not real 8. 1. —My dear! I made a mistake again. —_______ 2. ( B ) 1. Be careful. 2. 3. Don’t w orry. We can do something to make up for it. 4. 5. What a pity!
Unit 1 Outside view Activity 1 3.5 Activity 2 one of the best universities most talented students well-known around the world have open doors good social life you want it to be on another campus it's a fun place go to concerts during the week Activity 3 library system online three / 3 four / 4 Brian leisure purposes the libraries listening in Passage 1 1. 2 2. 6 3. 1 4. 5 5. 3 6. 4 2.Listen to Passage 1 again and rearrange the answers in the right column to match those questions in the left column. Ceahbgdf Passage 2 OC/O/C/O/C/C/O/C/O/OC
2.Listen to Passage 2 again and choose the best way to complete the sentences BDDBA Test CCBBD CDBCB C
Unie 2 Outside view Activity 1 1.Watch the video clip and match the speakers with the statements. K/K/T/S/T/K/S/K Activity 2 2.3.5 Activity 3 regarded along communicating But If during how as plays less LISTENING IN Passage 1 1.Listen to Passage 1 and match the colours with the characteristics
江南大学现代远程教育第二阶段练习题 考试科目:《大学英语（二）》 第一部分：交际用语（共5小题；每小题3分，满分15分） 此部分共有5个未完成的对话，针对每个对话中未完成的部分有4个选项，请从A、B、C、D四个选项中选出正确选项。 1．- Good morning, John . How are you doing?- _________ A：I’m pleased. B：Good night. C：Not so bad. And you? D：How do you do? 2．- How do I get to the cinema?- _________ A：It's very far. B：Yes, there is a cinema near here. C：It's well known. D：Go down this street and turn left. 3．- This is a challenging job. Who wants it? - _________ A：I'll take it. B：It's a good idea. C：You bet! D：No sweat! 4．- I hope you have a most happy and prosperous new year! - _________ A：You are welcome! B：How smart you are! C：The same to you! D：Nice going! 5．- Would you like to see a film?- _________ A：Yes, I'd love to. B：Do it, please. C：No, you like it? D：How do you do? 第二部分：阅读理解（共10小题；每小题2分，满分20分） 此部分共有2篇短文，第一篇短文后有5个问题。请从每个问题后的A、B、C、D四个选项中选出正确选项。第二篇短文后有5个正、误判断题，请选择T或F.
问题1 得2 分，满分2 分 1、--What does your father do? -- ___________. 答案 所选答案： C. C：He is a farmer 问题2 得2 分，满分2 分 2、-- How are you today? --___________, thank you. 答案 所选答案： A：Fine 问题3 得2 分，满分2 分 3、- _______ - You too! 答案 所选答案： A：Merry Christmas! 问题4 得2 分，满分2 分 4、- Good-bye for now. - _________ 答案 所选答案： C：See you. 问题5 得2 分，满分2 分 5、--Excuse me, could you tell me how to get to the post office? -- _____________. 答案 所选答案： D：Sorry, but I am a stranger here myself
问题6 得2 分，满分2 分 6、- How do I get to the cinema? - _________ 答案 所选答案： D：Go down this street and turn left. 问题7 得2 分，满分2 分 7、- Is it possible for you to work late tonight? - _______ 答案 所选答案： D：I think so. 问题8 得2 分，满分2 分 8、-- May I use your bike for a moment? -- ________ 答案 所选答案： C：By all means. 问题9 得2 分，满分2 分 9、-- Congratulations! You won the first prize in today's speech contest. -- ________ 答案 所选答案： C：Thank you. 问题10 得2 分，满分2 分 10、- How are you, Bob? - _______ 答案 所选答案： B：I'm fine. Thank you 问题11 得2 分，满分2 分 11、-- Would you like to go to the concert with us this evening? -- ________ 答案 所选答案： B：I'd love to, but I'm busy tonight. 问题12 得2 分，满分2 分
作业二 一、单选题 1、- Would you please show me your bankbook - _________ A：Sorry, I have no idea. B：Here you are. C：Come with me. D：Yes, I'd like to. 2、-- Did you win the 100 metre race -- Yes, I did. -- Really -- _________. A：Congratulations B：Best wishes C：Good luck D：Right-I'm sorry. Bob is not in his office. -_________ A：Can you take a message for me B：Are you sure for that C：Would you like to leave a message D：Can you phone me-I haven't seen Belly for 10 years. 3、 4、- I'm sorry. I lost the key. - ________
A：Well, it's OK. B：No, it's all right. C：You are welcome. D：You are wrong. 5、- Wow! This is a marvelous room! I've never known you're so artistic. - ______ A：Great, I am very art-conscious. B：Don't mention it. C：Thanks for your compliments. D：It's fine. 6、______is the temperature today A：What B：How C：How many D：How much 7、I ______ my home work this time yesterday evening. A：were doing B：was to do C：am doing D：was doing 8、Had you come five minutes earlier, you ______ the train to Birmingham. But now you missed it. A：would catch B：would have caught C：could catch