21. Relaxation, fresh air, pure water and clean food, is essential to a sound mind and healthy body.
A. much less than B. no less than
C. no more than D. any less than
22. It is far better to do well a bit of work which is well a large fortune.
A. worthy to be done than have B. worth doing than to have
C. worthwhile to do than have D. worthy of doing than have
23. Understanding the cultural habit of another nation, especially containing as many different subcultures as the United States, is a complex task.
A.one B. the one C. that D. such
24. Whether or not the next plan will yield any positive results to be seen.
A.remain B. remains C.is remained D. have remained
25. If ever again happens an accident like this, we will have only ourselves to blame.
A. it B. so C. there D. that
26. This is the most important respect civilized man can be distinguished from primitive communities.
A. which B. in which C. with which D. that
27. With production steadily, the factory needs an ever-increasing supply of raw materials.
A. having gone up B. goes up
C. gone up D. going up
28. I thought the technician was to blame for the blowing of the fuse, but I see now I was mistaken.
A. how B. that C. where D. why
29. Electronic computers, many advantages, cannot carry out creative work or replace man.
A. though having had B. which have
C. even if having D. over which have
30. The members of the delegation were glad longer than originally planned.
A.to be staying B. staying
C.to have stayed D. if they stayed
21. Bno less than “与……同样(重要)”。全句意为: “放松休息, 就像新鲜空气、纯净水、清洁的食品一样, 是健康的身心所不可缺少的。”
22. Bto have a large fortune与to do well a bit of work…是并列不定式。另外，worth, worthy, worthwhile在用法上的区别是:(1)worth是介词, 后接动名词或名词，形成介词短语。接动名词时, 与主语是动宾关系，其形式是主动的，意义是被动的。如: The book is worth reading. (2)worthy是形容词, 置于be动词后或名词后面, 做后位修饰语, 其结构是: be worthy of doing sth., sth. is worthy to be done。(3)worthwhile是形容词，要与形式主语it并用：It is worthwhile to read the book.worth和worthy都不能用于这种结构。
23. Aone 指代前面提到的具有泛指含义的可数名词单数, 在该句中指代another nation, 句中属于泛指，可见B是错误的。such指代前面讲过的整个情况，多用作主语。that 指物时常用来指代不可数名词, 指代可数名词时具有特指含义。
24. Bwhether 引导名词性从句做主语, 谓语动词应为单数。另外，remain一般不用被动式, 所以B为正确选项。
25. C这是there be句型的异化形式，即there be 句型中还可以用be以外的不及物动词，如live, stand, exist, come, remain等。
26. B要填入的成分在从句中做状语, 据此排除A、D。另外，respect要求介词in, 相当于in this respect “在这方面”, 故选in which。
27. D全句用的是一般现在时态, 说明一种情况, go 是非及物动词, 要填入的是with介词短语的一部分，应用动名词形式, 所以选going up。
28. Bthat引导宾语从句, see在句中的意思是understand。此句切不可从汉语角度理解成 “我怎么错了”或 “我为什么错了” 而错选了A或D。
29. Bwhich have many advantages是非限定性定语从句，在此有让步的含义。
30. C句子用的是过去时态…were glad…, 不定式完成式to have stayed表示这一动作发生在谓语动词were glad之前, 相当于：The members of the delegation were glad that they had stayed longer than originally planned.
