题目内容

大气十条提出具体目标,到2017年全国地级以上城市可吸入颗粒物PM10浓度比2012年下降_____________以上。【】

A. 10%
B. 5%
C. 15%
D. 50%

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下列属于气态大气污染物的是【】。

A. SO2
B. NO
C. N2
D. NO2

根据所学音标，选择不同发音

A. end
B. add
C. black
D. apple

Being somewhat short-sighted, she has the habit of ________ at people.

A. staring
B. glancing
C. peering
D. peeping

Before the school ________ what students must wear, they just wore anything.

A. managed
B. authorized
C. regulated
D. standardized