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下图为沿20°E经线所作的某大洲地形剖面图及高空大气环流形势图。读图，回答下列问题。

若下图虚线表示等压面，箭头表示空气运动方向，其中能正确表示上图中a地高低空等压面及空气运动特征的是（）

A.图A

B.图B

C.图C

D.图D

答案

参考答案：C

解析：读图可知，a为南回归线附近，根据全球气压带分布，该地为副热带高气压带，近地面为高压，盛行下沉气流，高空与近地面气压状况相反，结合选项，C符合，故选C。

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补全对话。（共4小题，每小题1分；计4分）

Li Yang: Good morning. Mathew.

Mathew: Good morning, Li Yang.    小题1:  

Li Yang: There's still smog (雾霾) today. We'll have to go to school with face masks(口罩).

Mathew:    小题2: According to the news, PM2.5 pollution is the main problem with air pollution.

Li Yang: Yes, and air pollution has done harm to people's health.

Mathew: So the Chinese government and Chinese people must take action to fight it.

Li Yang:    小题3:   

Mathew: Yeah. Since PM2.5 is mainly caused by vehicles(机动车)and factories, cars with large

emissions(排放)should not be allowed and factories should be closely watched.

Li Yang: I agree.  小题4:   And we suggest making the blue skies return for good.

Mathew: I hope so, too.
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