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  3. What is the one huge problem that we haven’t really solved? Which year is the fewest in violation of federal smog standards in

What is the one huge problem that we haven’t really solved? Which year is the fewest in violation of federal smog standards in

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问题 What is the one huge problem that we haven’t really solved?
Which year is the fewest in violation of federal smog standards in Los Angeles?
选项 A、1976
B、1979
C、1990
D、2004
答案D
解析 细节题。根据题干信息词the fewest和Los Angeles定位到第二个小标题第三段末句Between1976and 1990，the Los Angeles area averaged some 150 days per year in violation of federal smog standards: in 2004, that figure dropped to just 27 violation days，the fewest ever for that city，即：2004年违背联邦烟雾标准的日子最少，故选D。
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