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
【英语四级的词汇笔记】
