Our world is in danger. We must do something to protect the environment. But (A) ________ 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 (CO₂). (D)Too much of this gas pollutes the atmosphere, and causes it to keep in too much heat. 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)因为树吸收二氧化碳 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.

【小题1】在文中画线部分(A)和(C)的空白处填入适当的单词：________ ________
【小题2】写出文中画线部分(B)和(F)的同义词或近义词：________ ________
【小题3】将文中画线部分(D)改写为：The atmosphere ________ ________ by too much of this gas.
【小题4】将文中画线部分(E)译成英语：________________________________
【小题5】在文中找出两种燃料的名字：________ ________