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【单选题】
关于大气污染，以下说法正确的是。（）A.
为防治大气污染，应该关停所有污染大气的企业和设施
B.
大气有一定的自净能力，少量污染物进入大气后，通过物质转化和循环可以使污染物浓度降低
C.
在刮大风的时候集中排放污染物
D.
以上都不正确。
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举一反三
【简答题】The symptoms of heart disease, in men or women, are often caused by______.
【单选题】These old men often come to the and have a free talk with each other.
A.
tea room
B.
tea’s room
C.
room of tea
D.
teas room
【单选题】Men have often been praised by being told that they were as smart as a Philadelphia lawyer. No one knows why there is something special about Philadelphia lawyers, but the expression 'smart as a Phila...
A.
he wanted to make money quickly
B.
he was the royal governor
C.
he was a tyrant
D.
they were biased
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