`1.F`

`=>`Dẫn chứng : There are three main kinds of pollution. Air pollution, and water pollution and noise pollution. ( Câu 1,2 dòng 1 )

`2.T`

`=>`Dẫn chứng : Air , which is the most important element of our environment for our survival, can be polluted in many ways.

`3.T`

`=>`Dẫn chứng :  Smoke in the air from mills, factories and industry contains carbon monoxide, carbon dioxide, and methane, which are all poisonous gases.

`4.T`

`=>`Dẫn chứng : This leads to health problems like asthma and lung diseases, and the thinning of the ozone layer, which protects us from harmful UV rays.