历年托福考试语法真题全面解析41
1. When ---in arctic regions, the Aleuts construct igloos as temporary winter shelters.(A) travel
(B) to travel
(C) traveling them
(D) traveling
答案：D
测试点：省略句。
分析：引导状语成分的连词when可后接从句或亦可接分词。When+分词短语相当于从句省掉了主语和系词，即when(the Aleuts are)traveling in arctic legions．(A)动词原形和(B)不定式均不可与when连用作状语；(C)多了them.
解题要点：时间状语从句的连词(when,while)后可直接加分词短语。条件是这一从句的主语应与主句的主语同一人／物。
2. Most substances contract when they freeze so that the density of a substance’s solid is ---of its liquid.
(A) than the higher density
(B) higher than the density
(C) the density is higher than that
(D) the higher the density
答案：B
测试点：比较级／词序.
分析：比较级的句式要求动词+形容词或副词比较级+than+被比较的成份，4个答案中只有(B)符合此结构.
3. The mechanism by which brain cells store memories is ---clearly understood.
(A) none
(B) no
(C) not
(D) nor
答案：C
测试点：否定词.
分析：否定动词要用副词not.
4. Desert animals ---a means of retaining moisture in such a hot, dry climate if they are to survive.
(A) need
(B) needing
(C) to need
(D) was needed
答案：A
测试点：谓语.
分析：空格两边都是名词性成份，说明所缺为谓语动词．答案中(A)可作谓语．(B)(C)不能单独作谓语；(D)用了被动式，与句意不合。
5. ---state of Wyoming is also known as the “Equality State” because Wyoming women were the first in the nation to vote.
(A) The
(B) There is a
(C) That the
(D) As the
答案：A
测试点：冠词.
分析：空格后是一完整的复合句，空格内不可能填入带有连词或动词成分的(B)、(C)或(D)．这里缺少的是限定state of Wyoming的定冠词the.
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