The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

Atmospheric scientists in recent years have observed increasing concentrations of chlorofluorocarbons in the tertiary layer of the stratosphere, findings consistent with the documented growth in chlorofluorocarbon emissions from industrial activity.（）

A. findings consistent with the documented growth in chlorofluorocarbon emissions from industrial activity

B. which are consistent with the documented growth in chlorofluorocarbon emissions from industrial activity

C. a finding consistent with growth in chlorofluorocarbon emissions from industrial activity, as documented

D. finding documented growth consistent with chlorofluorocarbon emissions from industrial activity

E. which findings are consistent with industrial activity’s documented growth in chlorofluorocarbon emissions

阅读下列材料：

今天的美国奉行强权政治，任意干预他国事务，充当世界警察。然而，200多年前的美国，只是相对落后的英属殖民地。与英国相比，人口少，势力弱。但美国却以小胜大、以劣胜优、以弱胜强，打败了英国，赢得了民族独立战争的胜利。

请回答：

（1）你知道美国是在什么时间诞生的吗？其标志性事件是什么？

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（2）你知道美国独立战争的性质吗？

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（3）美国独立战争有何重要意义？

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