5．Scientists have helped people understand the dangers facing the earth．As people live on the earth，we should be fully ready to deal with the dangers．If we do not pay more attention to the problems caused by air pollution，our earth may no longer be a healthy place for plants，animals，and people to live．
Cleaning up the air is a job that all countries must work on．The problems caused by air pollution can be solved，but a lot of work needs to be done．Governments around the world are beginning to work together to lower the levels of dangerous gases in the atmosphere（大氣層）．If this can be done well，the ozone layer（臭氧層） can rebuild itself，global warming can be controlled，and acid rain can be reduced．
In 1967，the government of the United States passed the Clean Air Act．More parts were added to the act in 1970，1977and 1990．As a result of these laws，cars now must reduce the amounts of harmful gases．Power factories must use"clean coal"methods to reduce acid-rain gases they produce．
In 1970，the Environmental Protection Agency （EPA） was set up．The EPA's job is to make sure that the environmental laws are being followed and to find out new dangers and offer solutions．The first Earth Day was also celebrated in 1970．
While it is very important to address with air on a global scale，each person can also do something to protect the Earth．Here are some things you can do every day：
1）Turn down the heat and air conditioning．
2）Use the dishwasher only when they are full of dishes．
3）Practice the 3Rs：recycle，reuse，and reduce．
4）Plant a tree．
5）Walk or ride your bike．
76．If we don't care aboutA problems，our earth may no longer be a healthy place．
A．Air pollution
B．Water pollution
C．Noise pollution
77．Every country shouldB to solve the problems caused by air pollution．
A．rebuild the ozone layer
B．clean up the air
C．produce harmful gases
78．All the things the EPA can do is toC
A．make more laws
B．find out new dangers
C．protect the environment
79．The Clean Air Act was passedA by the American government．
A．In 1967
B．In 1970
C．In 1977
80．In our daily life，we can do something to protect the earth byB．
A．using more cars
B．riding the bikes
C．cutting down trees．
分析 如果我們不更多的關注大氣污染，地球將可能不再是人類，植物和動物可以生存的健康的地方了，政府將會一起努力降低大氣層里面的危險氣體，這樣能幫助重建臭氧層，控制全球變暖，在日常生活中我們也可以做些事情去保護我們的地球．
解答 ABCAB
76．A．細節(jié)題，結合第一段If we do not pay more attention to the problems caused by air pollution，our earth may no longer be a healthy place for plants，animals，and people to live．如果我們不更多的關注大氣污染，地球將可能不再是人類，植物和動物可以生存的健康的地方了，故選A．
77．B．細節(jié)題，結合第二段Cleaning up the air is a job that all countries must work on．可知清理大氣是所以國家都應該做的事情，故選B．
78．C．推理題．結合第四段The EPA's job is to make sure that the environmental laws are being followed and to find out new dangers and offer solutions是要確保環(huán)境法被實施，發(fā)現(xiàn)新的危險提供解決辦法，可知目的都是為了保護環(huán)境，故選C．
79．A．細節(jié)題，根據(jù)第三段In 1967，the government of the United States passed the Clean Air Act可知是1967年，故選A．
80．B．細節(jié)題，結合最后Walk or ride your bike．可知我們可以走路或者騎自行車去保護環(huán)境，故選B．
點評 閱讀題型，要注重句子與句子之間、段落與段落之間邏輯關系以及對篇章的整體理解．根據(jù)所給問題選擇正確選項完成試題．
