1. Corn originated in the New World and thus was not known in Europe until Columbus found it _____ in Cuba.
A. being cultivated B. been cultivated C. having cultivated D. cultivating
2. This kind of glasses manufactured by experienced craftsmen ______ comfortably.
A. is worn B. wears C. wearing D. are worn
3. It is our _____ policy that we will achieve unity through peaceful means.
A. consistent B. continuous C. considerate D. continual
4. He is ______ about his chances of winning a gold medal in the Olympics next year.
A. optimistic B. optional C. outstanding D. obvious
5. In Britain people ______ four million tons of potatoes every year.
A. swallow B. dispose C. consume D. exhaust
6. He ____ his father in appearance but not in height.
A. repeats B. looks C. resembles D. likes
7. In previous times, when fresh meat was in short ____, pigeons were kept by many households as a source of food.
A. store B. provision C. reserve D. supply
8. She ought to stop work; she has a headache because she ______ too long.
A. has been reading B. had read
C. is reading D. read
9. 1 don't mind ______ the decision as long as it is not too late.
A. you to delay making B. your delaying making
C. your delaying to make D. you delay to make
10. Without the ______ materials imported from abroad, Japan can hardly produce anything.
A. worth B. valuable C. spare D. raw
答案：1-5 ABAAC 6-10 CDABD