单选题
The author agrees with the ALA that ______.
A、
present smog standards should be made stricter
B、
the standard established by the EPA is effective
C、
some areas fail to meet the federal standard at times
D、
poor air quality is a major problem nationwide
【正确答案】
C
【答案解析】
第三段说，环境保护署认为有些地区仍然偶尔有臭氧超过联邦标准的现象，这是事实。所以正确答案是C(有些地区有时未达到联邦标准)。
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