历年托福考试语法真题全面解析20
16.A liquid is similar to a gas because has molecules are not fixed to each other in any specific way.答案：B
测试点：代词。
分析：在because从句中，主语molecules前应当是代词，不能用动词has。正确的词是its。
17.The Conestoga wagon, used for to carry heavy loads over long distances, originated around 1725 in a region of Pennsylvania occupied by the Conestoga Indians.
答案：A
测试点：词形/介词宾语。
分析：介词for后面要接名词性的成份作宾语。如动名词，不能接动词不定式。此处tocarry应为carrying。
18.Providence, Rhode Island, is a busy manufacturing city and seaport, as well the state capital.
答案：C
测试点：习语。
分析：As well as是固定短语，此处缺一as。
19.The young of most bird species are totally dependence on parental care after hatching.
答案：B
测试点：词性。
分析：dependence是名词，此处要用形容词dependent作表语。be dependent on是固定用法。
20.During most of this century, A. Philip Randolph struggled for Black rights in the United States and becomes an important figure in the labor movement.
答案：C
测试点：并列结构／时态一致。
分析：看到连词and，应想到它所连接的两部分关系对等、性质相同。句中and连接两个谓语部分，其时态应一致。becomes应为became，用过去式与straggled并列。
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