21. Until then, his family _D_ from him for six months.

A didnt hear B hasnt been hearing C hasnt heard D hadnt heard

until then 直到那时。 hear from sb. 收到某人的来信，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

见到介词by引导的时间状语，谓语动词就应是完成时态。

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. 对于某人来说均是一样的。 be equivalent to 相当于。

All tastes are alike to him. 所有味道对他来说都一样。

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. 学期； president n. 大学校长； take effect 生效，发生效力；

take part in 参与，参加； take place=happen 发生； takes turn to do sth. 轮流做某事。

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. 典礼，仪式；表达在某个典礼上介词用at。 vigorous adj. 强劲有力的，强有力的。

harsh adj. 刺耳的，令人不愉快的； flat adj. 平淡无奇的； tedious adj. 冗长无聊的。

29. It is useful to be able to predict the extent _C_ which a price change will affect supply and demand.

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 做梦也想不到。

21. Until then, his family _D_ from him for six months.

A didnt hear B hasnt been hearing C hasnt heard D hadnt heard

until then 直到那时。 hear from sb. 收到某人的来信，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

见到介词by引导的时间状语，谓语动词就应是完成时态。

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. 对于某人来说均是一样的。 be equivalent to 相当于。

All tastes are alike to him. 所有味道对他来说都一样。

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. 学期； president n. 大学校长； take effect 生效，发生效力；

take part in 参与，参加； take place=happen 发生； takes turn to do sth. 轮流做某事。

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. 典礼，仪式；表达在某个典礼上介词用at。 vigorous adj. 强劲有力的，强有力的。

harsh adj. 刺耳的，令人不愉快的； flat adj. 平淡无奇的； tedious adj. 冗长无聊的。

29. It is useful to be able to predict the extent _C_ which a price change will affect supply and demand.

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 做梦也想不到。