历年托福考试语法真题全面解析31
31. Principal known for his dictionary, Noah Webster was also the first epidimiologist in the United States.答案：A
测试点：词性.
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.
32. Liquid lubricants contrast widely in weighing, thickness, and boiling point.
答案：C
测试点：词性／并列结构.
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.
答案：A
测试点：习语/介词。
分析：interest in是固定短语，不用with。
34. Saint Elmo’s fire is a luminous blue discharge of electricity sometimes seen when a thunderstorm.
答案：D
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.
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