第11題 __electrons are still smaller.

　　A.As atoms small are

　　B.As atoms smaller as

　　C.Small as atoms are

　　D.Smaller atoms as are

　　【正確答案】：C

　　試題解析：as引導讓步狀語從句時，表語常放在as前面。

　　第12題 It was clever __ at the answer in two minutes.

　　A.of him to arrive

　　B.for him to arrive

　　C.for his arriving

　　D.of his arriving

　　【正確答案】：A

　　試題解析：比is+形容詞+of+名詞/代詞+不定式，of后的名詞/代詞為不定式的動作發(fā)出者。

　　第13題 Stop __, boys! It's time for class.

　　A.talking

　　B.to tal lk

　　C.talk

　　D.being talk

　　【正確答案】：A

　　試題解析：stop doing sth.表示“停止做某事”;stop to do sth.表示“停下來(開始)做某事”。

　　第14題 I liked to play football when I was young.__

　　A.So he was

　　B.So was he

　　C.So did he

　　D.So he did

　　【正確答案】：C

　　試題解析：表示與前面所說一致的情況下，如果是so開始，則主謂倒裝，但要注意其動詞應跟主句的動詞一致。

　　第15題 It is not __ to discuss the question again and again.

　　A.worth

　　B.worthy

　　C.worthwhile

　　D.worthwhile

　　【正確答案】：C

　　試題解析：be worth+名詞：值……的，be worth doing sth.：值得做，be worthy of+名詞：值得……的，be worthwhile to do sth.值得做某事。

　　第16題 Many countries face some serious problems of land use, __ result from population growth and the demands of modem technological living.

　　A.which most

　　B.most of which

　　C.most which

　　D.of most which

　　【正確答案】：B

　　試題解析：這是由which引導的非限制性定語從句。

　　第17題 Our boss told me my plan was still __ discussion.

　　A.in

　　B. under

　　C. of

　　D. with

　　【正確答案】：B

　　試題解析：under discussion表示“在討論中”，類似的還有under consideration(在考慮中)等。

　　第18題 Tom looks so pale today.He __ ill.

　　A.must be

　　B.had to be

　　C.should be

　　D.shall be

　　【正確答案】：A

　　試題解析：情態(tài)動詞must表示推測。

　　第19題 He said he __ the next day.

　　A.will come back

　　B.come back

　　C.would come back

　　D.came back

　　【正確答案】：C

　　試題解析：主句謂語動詞是過去時態(tài)，從句的時態(tài)應與主句一致。而從句中表示的是過去的將來，所以從句中的謂語動詞應用過去將來時。

　　第20題 George did __ than anyone else.

　　A.much work

　　B.more work

　　C.work much

　　D.work more

　　【正確答案】：B

　　試題解析：當比較級結構中的more、less等詞為限定詞時，名詞只能置于比較級結構中間。