历年托福考试语法真题全面解析28
16. Sea turtles date back 100 million year and are the only ancient sea reptiles to survive the present Day.答案：A
测试点：数的一致.
分析：有阿拉伯数字出现时，应特别注意其后紧接的名词是否应为复数．这里year应为复数。
17. At a first, the scientific method may appear to be a narrow and restrictive way of gaining understanding.
答案：A
测试点：习语。
分析：At first是固定短语，a多余.
18. Since prehistoric times, artists have portrayed subjects that representative their culture.
答案：D
测试点：词性。
分析：that是从句主语，后面接谓语动词。此处应当用动词represent而不用形容词representative.
19. How many people realize that agriculture is a source of raw materials for clothing and to shelter?
答案：D
测试点：词性／并列结构.
分析：看到…and…，应想到它前后两部分同词性、同形式．此处要用名词shelter与clothing并列.
20. Mammals lose body heat to them environment in cold weather more quickly than in hot weather.
答案：B
测试点：代词.
分析：environment为名词，前面要用形容词性的代词their作定语，不能用them.
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