In order to be a success in the American business world, you must “get along” with people. You must learn to conduct yourself in such a way _1_ you earn the affection and respect of others._2_ we have already pointed out, Americans_3_ business and pleasure. Therefore, learning how to _4_ informally can be a help with your American business _5_.Americans like to talk about a _6_of different topics—sports, politics, cars, popular movies and television shows and personal interests. Many large American cities have sports teams. If you are _7_ with Americans in the United States, it would be a good idea to _8_out about the local sports teams so that you can _9_ in the almost inevitable discussions about “how our _10_ will do this year” .Politics can be a _11_ topic unless everyone is of the same mind _12_.Limit your discussions to asking questions of your friends. Most Americans are _13_ owners and some are even obsessive about the subject. You can contribute _14_talking about cars you have owned or by _15_ information you have read in automotive magazines. Americans watch television almost every night and attend movies regularly,
_16_ naturally television shows and the _17_ movies become topics for discussions. If you are unable to _18_ American television or attend American movies, reading the _19_ section of such magazines as Time News week will keep you up to date on _20_is popular in America.
1. A. which B. where C. as D .that
2. A. While B. Since C. As D. Because
3. A. mix B. enjoy C. like D. manage
4. A. conduct B. appear C. behave D. chat
5. A. friends B. efforts C. contacts D. companies
6. A. bit B. total C. group D. number
7. A. meeting B. working C. living D. playing
8. A. find B. learn C. go D. stay
9. A. work B. participate C. succeed D. break
10. A. group B. business C. company D. team
11. A. common B. sensitive C. special. D daily
12. A. politically B. economically C. professionally D. personally
13. A. house B. car C. business D. land
14. A. to B. toward C. by D. through
15. A. collecting B. sharing C. gathering D. analyzing
16. A. so B. therefore C. thus D. hence
17. A. interesting B. exciting C. excellent D. latest
18. A. witness B. look C. watch D. glance
19. A. entertainment B. sports C. business D. movie
20. A. which B. that C. what D. as
称为肽键。今有一个“多肽”，其分子式是C55H70O19N10，已知将它彻底水解后只得到下列四种氨基酸：
