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.