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    21. Until then, his family _D_ from him for six months.
    A didn't hear B hasn't been hearing C hasn't heard D hadn't heard
    until then 直到那時。 hear from sb. 收到某人的來信，得到某人的消息。
    22. The conference _B_ a full week by the time it ends.
    A must have lasted B will have lasted C would last D has lasted
    見到介詞by引導(dǎo)的時間狀語，謂語動詞就應(yīng)是完成時態(tài)。
    24. Physics is _B_ to the science which was called natural philosophy in history.
    A alike B equivalent C likely D uniform
    be alike to sb. 對于某人來說均是一樣的。 be equivalent to 相當(dāng)于。
    All tastes are alike to him. 所有味道對他來說都一樣。
    27. The new appointment of our president _A_ from the very beginning of next semester.
    A takes effect B takes part C takes place D takes turns
    semester n. 學(xué)期； president n. 大學(xué)校長； take effect 生效，發(fā)生效力；
    take part in 參與，參加； take place=happen 發(fā)生； takes turn to do sth. 輪流做某事。
    28. The president made a _A_ speech at the opening ceremony of the sports meeting, which encouraged the sportsmen greatly.
    A vigorous B tedious C flat D harsh
    ceremony n. 典禮，儀式；表達(dá)在某個典禮上介詞用at。 vigorous adj. 強(qiáng)勁有力的，強(qiáng)有力的。
    harsh adj. 刺耳的，令人不愉快的； flat adj. 平淡無奇的； tedious adj. 冗長無聊的。
    29. It is useful to be able to predict the extent _C_ which a price change will affect supply and demand. [extent to]
    A from B with C to D for
    30. Finding a job in such a big company has always been _D_ his wildest dreams.
    A under B over C above D beyond
    beyond one’s wildest dreams 做夢也想不到。
    31. It is not easy to learn English well, but if you _C_, you will succeed in the end.
    A hang up B hang about C hang on D hang onto
    hang on 堅持，繼續(xù)下去。
    32. It is reported that _C_ adopted children want to know who their natural parents are.
    A the most B most of C most D the most of
    most單獨出現(xiàn)的時候有兩種詞性要考慮：1 adv. 非常；2 adj. 大多數(shù)的。
    the most后面加多音節(jié)的形容詞或副詞構(gòu)成該句的級。
    most of + 名詞，表示這些名詞中的大多數(shù)。 make the most of 充分利用。
    34. _D_ before we depart the day after tomorrow, we should have a wonderful dinner party. [Were they to arrive=If they were to arrive]
    A Had they arrived B Would they arrive C Were they arriving D Were they to arrive
    35. The strong storm did a lot of damage to the coastal villages: several fishing boats were _A_ and many houses collapsed.
    A wrecked B spoiled C torn D injured
    collapse vi. 倒塌，坍塌； wreck vt. （船只）遭到破壞。
    torn原形是tear，n. 眼淚，vt. 撕裂，撕開。
    37. As _B_ announced in today's papers, the Shanghai Export Commodities Fair is also open on Sundays.
    A being B is C to be D been
    注意兩個非限定性定語從句的引導(dǎo)詞：as, which。
    which在做非限定性定語從句引導(dǎo)詞時有兩個特點：
    1 which前要有逗號與前面句子分開； 2 which引導(dǎo)非限定性定語從句指的是前面整句話的內(nèi)容。
    只要引導(dǎo)非限定性定語從句as和which都指一句話內(nèi)容，區(qū)別在于which只能放在它所指那句話的后面，而as可以在前面也可以在后面。