历年托福考试语法真题全面解析47

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31. During the 1600’s skilled shoemakers scarce were in what is now the United States.  
  
3 ?# G- w/ B& Q. E3 {& w& R答案：C
0 @9 P# K2 [0 z2 c测试点：词序.
2 ^/ o9 Z8 C  [分析：形容词scarce应置于系词were的后面，作表语.
  
6 M6 |# |; x. m, ], D32. If a atom loses any of its electrons, it becomes positively charged and can combine chemically with other atoms.  
  
答案：A
3 H4 @% `/ U* f1 y测试点：冠词.
* W1 S$ t# P1 E, M6 f0 q: }分析：a和an的用法atom是以元音开头的名词，前面冠词要用an而不用a.
' W  L( m$ O: t/ U3 j2 N: j解题要点：注意划线的冠词a或an是否用错.
  
33. The National Education Association conduct extensive research on a great many aspects of education.
$ G' ]$ i3 [; B  G' f* C  z. ]' f  
答案：A
测试点：主谓数的一致。
分析：主语Association为单数，谓语动词也要用单数形式。应为conducts。
  
7 S/ A6 |: R( @6 N6 ~34. The pain-killing agent most commonly administered in dentistry is the local anesthetic, who produces loss of feeling only in a specific area.
  
7 z  N8 J* h5 c0 i4 e答案：C
测试点：从句连接词who和which的用法.
5 S0 k# m! u- i9 r1 L+ ?分析：定语从句修饰说明anesthetic(麻醉剂)，作主语的关系代词，指代的是物不是人，不能用who．应为which.
解题要点：who/which混淆用错的题型在TOEFL考题中很常见．遇到这两个关系代词划线时，应务必认清它所限定的先行词是人还是物.
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/ @. I7 k7 t: M2 t  G7 P- q/ i35. Certain types of computers work properly only in environments with controlled precisely temperatures.  
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答案：D
, `& Y: J' K( O. }4 b测试点：词序.
; `8 m* f, R5 o- K+ ?9 E7 e分析：分词作定语时，与其所修饰的名词之间不要加入副词．应为precisely controlled(temperature)。