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考研
From the first sentence of the passage, we learn that______ Why is acid rain little understood?______
From the first sentence of the passage, we learn that______ Why is acid rain little understood?______
admin
2014-06-13
67
问题
From the first sentence of the passage, we learn that______
Why is acid rain little understood?______
选项
A、Because it is a new phenomenon
B、Because it is not frequent enough
C、Because its formation is complex
D、Because it is difficult to study it
答案
C
解析
第三段第二句指出,由于大气中酸雨形成的化学反应很复杂,几乎不为人们所了解。
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考研英语一
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