历年托福考试语法真题全面解析52
16. The unit of measurement known as a “foot” has originally based on the average size of the human foot.答案：B
测试点：习语.
分析：Be based on是固定短语。此处应为was．这个短语在TOEFL考题中以不同形式出现过多次。
17. Social reformer Florence Kelly played a role in the 1893 decision of the Illinois legislature to prohibition child labor.
答案：D
测试点；词性.
分析：prohibition为名词此处应用动词prohibit.
解题要点；划线的是以-tion结尾的名词，而前面是to，应考虑它是否错用，是否应为动词.
18. The term “technology” refers to the discoveries and inventions that help people improve its way of life.
答案：D
测试点：代词数的一致.
分析：此处代词指代people，是复数意义，应用复数的their.
19. Brooklyn, New York, had a population of about 23,000 when it becomes a city in 1834.
答案：C
测试点：时态.
分析：由时间状语1834推知，谓语动词不能用现在时，而应用过去时，即became.
解题要点；考题中有具体数字表示的时间状语时，要留意句子的谓语动词是否应为一般过去时。
20. People can remember more information for higher periods of time when they use more than one sense in the process of learning.
答案：B
测试点；词意.
分析：higher指高度，而修饰表示时间阶段的periods应用longer.
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