历年托福考试语法真题全面解析37
21. Due to its excellent tensile strength, acetate rayon is an important material for products so as balloons, parachutes, fire hoses, and webbing.答案：C
测试点：习语。
分析：看到紧接其后的耶，应想到这里要用such。Such as是固定短语。
解题要点；such as是TOEFL考题中常见的短语.
22. It has not been determined how years sea turtles can live in their natural environment, but they will reach a very old age if left undisturbed by humans.
答案：A
测试点：缺词.
分析：how是副词，后面不能直接加名词．应为how many years.
23. A footnote is characteristically employed to give information that is too long or too detailed be included in the body of a text.
答案：D
测试点：too…to…的用法.
分析：看到前文的两个too,应立即注意后面是否有to…的部分．此处动词be前缺to.
24. Watercolors dry more faster than other paints.
答案：C
测试点：比较级形式重复。
分析：遇到形容词或副词的比较级，应注意其比较形式是否重复。此处应去掉more.
25. In mathematical terms, modern algebra is set of objects with rules for connecting or relating those objects.
答案：B
测试点：冠词.
分析：set是可数名词，它前面一定要有冠词．应为…a set(of)….
解题要点：TOEFL同类考题还有a group of，a series of, a blend of.
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