9 If wool is put into hot water， it tends to shrink.

　　A disappear

　　B expand

　　C break

　　D contract

　　10 The train came to an abrupt stop， making us wonder where we were

　　A an uncertain

　　B a slow

　　C an unexpected

　　D a smooth

　　11 Almost all economists agree that nations， gain by trading with one another.

　　A work

　　B profit

　　C rely

　　D prove

　　12 The conference explored the possibility of closer trade links.

　　A denied

　　B investigated

　　C stressed

　　D created

　　13 The chemical is deadly to rats but safe to cattle

　　A fatal

　　B hateful

　　C good

　　D useful

　　14 During his lifetime he was able to accumulate quite a fortune.

　　A control

　　B spend

　　C collect

　　D exchange

　　15 Its impolite to cut in when two persons are holding a conversation

　　A leave

　　B talk loudly

　　C stand up

　　D interrupt

　　答案：1. C 2. C 3. C 4. C 5. A6. C 7. D 8. B 9. D 10. C11. B 12. B 13. A 14. C 15. D