问题 填空题

2013年1月份全国出现大面积雾霾天气,由于空气质量下降导致大雾天气越来越多,对当地的交通造成了很大影响,其中雾是空气中的水蒸气遇冷_________形成的,我们经常听说的PM2 5是指大气中直径小于或等于2.5       (填单位符号)的颗粒物,由于粒径过小,又称可入肺颗粒物,可随呼吸进入人体内,因而对人体健康有害。

答案

液化 

题目分析:雾是空气中的水蒸气遇冷液化为液态的小水滴;PM2.5是指大气中直径不大于2.5微米的颗粒物,也称为入肺颗粒物,由于颗粒物小,人体吸气时可直接进入肺中.它的主要来源是日常发电、工业生产、汽车尾气排放等过程中经过燃烧而排放的残留物。

阅读理解

阅读理解。

     There are two deaf men in a small village.  One is Mr. Green and the other is Mr. Brown.  They live

near to each other. They are good friends .              

     They often talk together. They talk about all kinds of things.  Sometimes they are worried about their

hearing.  But one thinks the other is much deafer.            

     One day, Mr. Brown comes to Mr. Green' s house.  Mr. Green is. sitting in a chair,he is having a rest.Mr. Brown stops at the door and asks,' "Can you hear me?"There is no answer.  Mr. Brown goes near

and asks again, "Can you hear me?"Again he doesn't hear any answer.  Mr. Brown is quite pleased.  Still

he goes nearer and asks for the third time. Still there is no answer. At last Mr. Brown goes up to Mr.

Green and says,"now I know you are much deafer than me. You don't hear my questions. " "I am much

deafer?" says Mr.Green, "No, I answer you three times, but you don't hear my answer. "    

1. The two deaf men live in __________ .

A. China

B. a city

C. a village

D. a large village

2. They often __________together.

A. swim

B. listen to music

C. sing

D. talk

3. Why is Mr. Brown pleased one day? Because he ____________

A. goes to Mr. Green' s house

B. thinks Mr. Green is deafer

C. asks a question

D. is deaf

4. They often talk about ___________.

A. some interesting things

B. happy things

C. their hearing

D. all kinds of things .

5. Which is not right?

A. Both Mr. Brown and Mr. Green are deaf.

B. One of them thinks the other is deafer

C. They are womed about their money.

D. Mr. Brown is deafer.

单项选择题 B1型题