The author’s main purpose in writing the article is to warn of______. We learn from the third paragraph that______.

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问题 The author’s main purpose in writing the article is to warn of______.
We learn from the third paragraph that______.

选项 A、London was plagued with rats in the 1950s.
B、London is covered with smog today.
C、London was polluted by smog in the 1950s.
D、Los Angeles is as heavily polluted today as London was in the 1950s.

答案C

解析 利用备选项的特点:备选项中都涉及London,于是选用该词为答案线索词,在第3段第3句中找到答案相关句,原句说“使伦敦受灾的工业烟雾”,所以答案为C。
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