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.  
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6 N& y6 m8 d* s" a1 V答案：C
2 Y  `8 j) R- O8 P$ T测试点：词序.
分析：形容词scarce应置于系词were的后面，作表语.
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32. If a atom loses any of its electrons, it becomes positively charged and can combine chemically with other atoms.  
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* z, `$ I- ~: [2 H! z答案：A
: o/ }; s' E. y8 X测试点：冠词.
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.
3 k2 t, d3 ~# X: e解题要点：注意划线的冠词a或an是否用错.
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33. The National Education Association conduct extensive research on a great many aspects of education.
  
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。
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34. The pain-killing agent most commonly administered in dentistry is the local anesthetic, who produces loss of feeling only in a specific area.
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& h( v  N" c* \; T0 i4 V+ _答案：C
0 g( \% v' g0 T0 E$ L/ _! d测试点：从句连接词who和which的用法.
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.
  
35. Certain types of computers work properly only in environments with controlled precisely temperatures.  
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% a- U+ v! H% h1 t& J. v3 Z答案：D
测试点：词序.
9 g8 S* V* f; C* x  a: }2 D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)。