Question

13．The earth is 4，600 million years old．We humans have lived on the earth for only 35，000 years，but during this period we have changed our planet a lot in many ways．Some things we're done are evey good for the earth while some are bad．
    Fewer trees   All over the world，people have cut down millions of trees．When it rains or when the wind blows，the earth is taken away．Forests have become deserts，so more and more sorts of animals and plants are disappearing．
    Traffic and factory pollution    In big cities，cars and buses have polluted the air．Now many people in cities have health proplems．Factories have also polluted the land and the water．As a result，many rivers and lakes are now dead．
    The ozone layer （臭氧層）    Around the earth，there's a special kind of oxygen（O₂）called"oaone"（O₃）．It is important to the earth．But now air pollution is destroying it and that has made a very big hole in the ozone layer．Too much harmful radiation（輻射）from the sun passes though the hole and reaches the earth directly．This is very dangerous because it can cause cancer．
     More carbon dioxide （CO₂） Carbon dioxide in the air has increased a lot．It mainly comes from burning oil，coal and wood．This has formed a"blanket"around the each．The heat from the sun can't eacape so the temperature is rising．This is called"the greenhouse effect（溫室效應）"．It causes the level of the ocean to rise and the climate（氣候）of the earth to change．
    All these problems are very serious，so we must do something now．
73．Which of the following is right according to the passage？C
A．Cars don't pollute the air．
B．People cut down fewer trees．
C．Factories can pollute the water．
D．We humans have changed our planet a little．
74．What does the underlined word"it"in the passage refer to？B
A．CO₂．
B．O₃．
C．O₂．
D．H₂O．
75．What makes the level of the occeans rise？C
A．Pollution．
B．Fewer trees．
C．The greenhouse．
D．Changes in the climate．
76．What is the best title for this passage？A
A．Environment Problems．
B．Hope for the Future．
C．Pollution on the Earth．
D．The Greenhouse Effect．

Answer 1

分析 短文介紹了對地球造成破壞的兩在問題：臭氧層被破壞和溫室效應，提倡大家保護地球．

解答 答案：73．C  細節(jié)判斷題．根據(jù)第三段句子Factories have also polluted the land and the water．工廠也污染了土地和水．可知工廠可以污染水是正確的．故選C．
74．B  細節(jié)推理題．根據(jù)上文The ozone layer （臭氧層） Around the earth，there's a special kind of oxygen（O₂）called"oaone"（O₂）．It is important to the earth．But now air pollution is destroying it．圍繞地球的臭氧層，有一種特殊的氧氣（O2）稱為"臭氧"（O₃），對地球是很重要的．但現(xiàn)在空氣污染正在破壞它．可知這里it指的是上文提到的臭氧，故選B．
75．C  細節(jié)理解題．根據(jù)倒數(shù)第二段最后一句This is called"the greenhouse effect（溫室效應）"．It causes the level of the ocean to rise and the climate（氣候）of the earth to change．這就是所謂的"溫室效應"．導致海洋的水平上升和地球氣候的改變．可知是溫室效應．故選C．
76．A  主旨歸納題．根據(jù)整篇文章內(nèi)容及其第四段句子The ozone layer （臭氧層） Around the earth，there's a special kind of oxygen（O₂）called"oaone"（O₃）．It is important to the earth．But now air pollution is destroying it．圍繞地球的臭氧層，有一種特殊的氧氣（O2）稱為"臭氧"（O₃），對地球是很重要的．但現(xiàn)在空氣污染正在破壞它．和 倒數(shù)第二段最后一句This is called"the greenhouse effect（溫室效應）"．It causes the level of the ocean to rise and the climate（氣候）of the earth to change．這就是所謂的"溫室效應"．導致海洋的水平上升和地球氣候的改變．可知本篇短文介紹了對地球造成破環(huán)境壞的兩個問題：臭氧層被破壞和溫室效應，提倡大家保護地球．故選A．

點評 在通讀全文的基礎上，根據(jù)全文大意，展開邏輯思維，瞻前顧后，認真觀察選項，仔細推敲，確定最佳答案．