The World Is in Danger
Our world is in danger. （A）我們必須做些事情來保護環(huán)境。But，what are the main problems we face？
    The greenhouse effect
    The atmosphere around the Earth is necessary for all living things.It is like the glass of a greenhouse，letting sunlight in and （ B） keeping heat from getting out.Without it，the Earth would be the same （C）_____the Moon-cold and lifeless.
    When we burn fuels such as petrol and coal，we produce a gas called carbon dioxide.Too much of this gas pollutes the atmosphere and causes it to keep in too much heat. （D）As a result of the greenhouse effect，the Earth's temperature is increasing.This causes sea level to rise and in the future may cause cities to disappear.
    Cutting down forests
    Every year，we destroy nature by cutting down huge areas of forests.This makes the greenhouse effect worse （E）_____trees take in carbon dioxide and produce oxygen.Cutting down trees also destroys the homes of the animals that live in our forests and causes the surface of the soil to be easily destroyed by rain.This can （F） result in floods and even more damage to the environment.

（1）將文中畫線部分（A）譯成英語：

We must do something to protect the environment。

We must do something to protect the environment。

.
（2）寫出文中畫線部分（B）和（F）的同義詞或近義詞：

stopping

stopping

；

cause

cause

.
（3）在文中（C）和（E）的空白處填入適當?shù)膯卧~：

as

as

；

because

because

.
（4）將文中畫線部分（D）改寫為：

Because

Because

of the greenhouse effect，the Earth's temperature is

rising

rising

.
（5）從文中找出兩個大氣中存在的氣體名稱：

carbon dioxide

carbon dioxide

；

oxygen.

oxygen.

.