1. In ancient China, people used to send smoke _____ to warn that the enemy were coming.

　　A. signs B. signals C. symbols D. marks

　　答案: B

　　解析: 這個題考四個名詞的比較, 其中: signs 跡象; signals 信號; symbols 象征; marks 分?jǐn)?shù).

　　2. The icy conditions made our travel dangerous. So _____ going by car we took the underground.

　　A. instead of B. in addition to

　　C. as well as D. at the cost of

　　答案: A

　　解析: instead of 代替,而不是; in addition to 除了…之外(還有); as well as 也(除…之外), 既…又…; at the cost of 以…為代價. 這道題橫線后面是動名詞形式,所以選項C和D首先排除.

　　3. Sometimes my job is boring, but _____ I enjoy it.

　　A. by contrast B. by nature

　　C. on the whole D. on the average

　　答案: C

　　解析: by contrast 與…相比,后面要跟with, by contrast with與…相比較; by nature 本性,生性; on the whole 總的來說; on the average 平均.

　　4. I’ll buy the clock _____ it costs.

　　A. what B. whatever C. where D. however

　　答案: B

　　解析: 不管花多少錢,我都買下這個鐘.

　　5. _____ Mr.Wilson is well again, he can travel.

　　A. Now that B. So far C. Though D. Even if

　　答案: A

　　解析: Now that 既然; So far和現(xiàn)在完成時態(tài)連用.