II. Grammar and Vocabulary (31%)
Section A 17%
Directions: Beneath each of the following sentences there are four choices marked A, B, C or D. Choose the one answer that best completes the sentence.
21. The businessperson wanted to sell his goods fast; ______, he chose his partner with great care.
A. therefore B. otherwise C. for D. however
【答案】A
【解析】考查连词。A. therefore因此；B. otherwise否则；C. for因为；D. however然而。句意：这位商人想快点把货物卖掉，因此他很细心的选择同伴。故A正确。
22. By the time he was ten, Edison _________ experiments in chemistry.
A. had already done B. already had done C. was already doing D. already did
【答案】A
【解析】考查时态。根据句中时间状语By the time he was ten到他十岁的时候，可知用过去完成时。句意：爱迪生十岁时,已经开始做化学实验了。故A正确。
23. His mother happened _______ when his program was shown on Channel Young.
A. watching TV B. to watch TV C. to be watching TV D. being watching TV
【答案】C
【解析】考查非谓语动词。本题考查动词happen的用法：happen to do碰巧做，根据when his program was shown on Channel Young可知用不定式的进行时。句意：当他的节目在《生活时尚频道》播出的时候，他的母亲碰巧在看电视。故C正确。
24. _______, the more exercise you do, the richer your knowledge will be.
A. It is known to all B. Which is known to all
C. As we all know D. As is known to all that
【答案】C
【解析】考查定语从句。根据句中的逗号可知，本题为非限定性定语从句。Which引导非限定定语从句不可放在句首。句意：正如我们都知道的，你练习做得越多，你的知识就越丰富。故C正确。
