历年托福考试语法真题全面解析20

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16.A liquid is similar to a gas because has molecules are not fixed to each other in any specific way.
  
" e4 z7 r. e% P) x答案：B
% N  m: q: @! P2 [6 k/ c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。
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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。
6 e5 _) U# N( R& M) J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。
  
" O! P+ d4 M, D' j7 b3 @3 X18.Providence, Rhode Island, is a busy manufacturing city and seaport, as well the state capital.
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; n! o7 x0 S1 n  F, R答案：C
" m3 t2 @" |4 k' k) U& {: S测试点：习语。
8 L1 _$ B: c+ z' R+ O) V分析：As well as是固定短语，此处缺一as。
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19.The young of most bird species are totally dependence on parental care after hatching.  
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$ u: o: \; I! V* a, u答案：B
; m1 r8 P: p1 `) P5 }0 a) `  g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。
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0 `5 K0 O' m6 I) i; i' e: N+ `# @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.
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答案：C
测试点：并列结构／时态一致。
" M# m; }) `/ c% Q  [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。