历年托福考试语法真题全面解析36
16. The methods of spectrum analysis vary according to the wavelength region were studied.答案：D
测试点：多词.
分析：过去分词studied作后置定语修饰region，其作用相当于定语从句省去which/that及系词be。这里的were应删掉。
17. Hurricanes are severe cyclones with winds over seventy-five miles an hour who originate over tropical ocean waters.
答案：C
测试点：从句连接词.
分析：who和which的用法．句中，定语从句修饰的是物而不是人，连接词不能用who，应用that或which.
解题要点：定语从句连接词who(人)和which(物)的错用也是TOEFL常考题型之一.
18. A great proportion of the seeds of desert flora they possess germination-inhibiting substances.
答案：C
测试点：多词.
分析：possess为谓语动词，主语为前面的A great porportion，此处无需重复主语，they多余。
19. Window treatment, furniture arrangement and color combine all contribute to the overall impression of a room.
答案：B
测试点：词性／并列结构.
分析：看到and，要注意其两边成份是否同词性，同性质．and前是名词词组，而此处combine为动词，应为名词combination，与treatment和arrangement并列.
解题要点：当连接词and连接两项或更多项目时，应特别注意相连各成分的结构，词性相同.
20. Harvesting of grains is affected by annual changes in temperature or in the amount of moisture, but both.
答案：D
测试点：连词.
分析：此处不是转折的关系，而是选择，不能用but,应当用or．or both是固定说法.
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