PM2．5指大气中直径小于或等于2．5微米的颗粒物，也称为可入肺颗_爱下问搜题

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问题选择题

PM2．5指大气中直径小于或等于2．5微米的颗粒物，也称为可入肺颗粒物。珠江三角洲是全国第一个将PM2.5纳入空气质量评价并率先公布数据的城市群地区。右图为2012年3月16日7时广东省环境监测中心发布的珠三角地区PM2.5均值分布图，读图回答下列问题。

小题1:下列四城市中，空气质量最好的是

A．佛山

B．广州

C．珠海

D．惠州小题2:导致图中珠三角PM2．5浓度偏高的原因，不正确的是

A．人口稠密，汽车数量大

B．城市人口比重高，森林绿地比重低

C．经济发达，工厂企业多

D．强冷空气南下，气温下降

答案

小题1:C

小题2:D

题目分析：

小题1:空气污染指数指空气被污染的程度，指数越大，空气污染越严重，当空气污染指数小于50时，空气质量级别是一级，空气质量状况是优，当空气污染指数在51-100之间时，空气质量级别是二级，空气质量状况是良，图中空气质量最好的城市有珠海和深圳市等，PM2.5均值是（0-35）微克/立方米。

小题2:人口稠密、汽车数量大、工业发达、工厂企业多、潮湿少风都可能导PM2.5浓度升高，而强冷空气南下，气温下降，不属于导致PM2.5浓度升高的因素。

完形填空

A certain student passed all his examinations. Then he went to college to 21 his studies. There he wrote down his 22 for a course in English, but after the first 23 , he didn’t go to it any more.
The English lecturer 24_this student was always absent (缺席的) and thought he had 25_to another course, so he was 26 when he saw the boy’s name on the list of students who wanted to take the English 27at the end of this year.
The lecturer had 28 a difficult paper, which followed his 29 closely, and he was eager (热切的) to see 30 this student would answer the questions. He 31__the boy’s answers would be very bad, but when they 32 him and he examined them 33 , he was able to find only one small mistake in them. As this surprised him greatly, he 34 the paper repeatedly but still couldn’t find more than one mistake, so he 35 for the student to question him about it.
When he came and sat down, the lecturer asked him, “I 36 you came to my first lecture and you’ve been absent from all the others. But I’ve examined your 37 carefully and I’ve found only one small mistake in it. I’m curious (好奇的) to know your 38 .”
“I’m very 39 about that mistake,” answered the student. “After the examination, I 40 what I should have done. I would not have made that mistake if I had not been confused by your first lecture.”

D．explanation

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