历年托福考试语法真题全面解析31

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31. Principal known for his dictionary, Noah Webster was also the first epidimiologist in the United States.
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0 J4 v( T$ R$ n8 `, |# D答案：A
/ G/ k8 d% Q, P0 b9 `: j测试点：词性.
: j1 @" }! l/ D6 h2 q分析：修饰动词的过去分词known要用副词principally，而不能用形容词principal.
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2 z  o/ X6 ?* ]+ y: Q" z1 `% P32. Liquid lubricants contrast widely in weighing, thickness, and boiling point.  
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答案：C
测试点：词性／并列结构.
" ]+ \. Y% M  m分析：关键词是and，它要求其前后成份同词性、同性质．此处当用名词weight与thickness和point并列.
  
33. Interest with major social events led to a period of growth in journalism after 1945.  
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* V2 j, P# p- g3 `( E答案：A
测试点：习语/介词。
, I3 x1 Y; [9 h% T. y6 }分析：interest in是固定短语，不用with。
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; m* q/ |' ]- C6 V& h( q9 H34. Saint Elmo’s fire is a luminous blue discharge of electricity sometimes seen when a thunderstorm.
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答案：D
, R2 O# {% s+ _测试点：介词.
分析：表示时间概念的连词和介词经常错用．连词when后只能接从句或分词而这里后接名词，不能用when，只能用介词in或during.
  
35. Almanacs in simple form have been known from the invention of writing.  
  
答案：B 测试点：since和from的用法.
分析：since和from常被相互错用．由have been known知道此句是现在完成时态，应想到时间状语该用since，不能用from.