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(gè)題考四個(gè)名詞的比較, 其中: signs 跡象; signals 信號(hào); 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(jià). 這道題橫線后面是動(dòng)名詞形式,所以選項(xiàng)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(lái)說(shuō); 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(gè)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(shí)態(tài)連用.