#deijnv.

`1.` There are three main kinds of pollution.

`-` Dẫn chứng : Câu đầu đoạn.

There are three main kinds of pollution - air pollution , water pollution and noise pollution.

`2.` Air is the most important element of our environment for our survival.

`-` Dẫn chứng : Câu thứ 2.

Air , which is the most important  element of our environment for our survival...

`3.` Yes , they are.

`-` Dẫn chứng : China , the USA , Russia , India , Mexico and Japan are the world leaders in air pollution emissions.

`4.` The constant sound causes headache , tension , mental stress and migraines to human body.

`-` Dẫn chứng : This kind of constant sound also causes headache , tension , mental stress and migraines.

1 three main kinds of pollution

- D/c: There are three main kinds of pollution - air pollution, water pollution and noise pollution.

2 Air.

- D/c: Air, which is the most important  element of our environment for our survival, can be polluted in many ways.

3 Yes.

- D/c: China, the USA, Russia, India, Mexico and Japan are the world leaders in air pollution emissions.

4 headache, tension, mental stress and migraines.

- D/c: This kind of constant sound also causes headache, tension, mental stress and migraines.