Unit 2 4000 essential words in english 4

Factories often e (a)   harmful gases into the atmosphere, contributing to air pollution.

A p (a)   is any chemical or biological agent that causes pollution.

Burning fossil fuels releases c________ ________ into the air, which contributes to global warming.

(a)  

Engineers are working on new technologies that will e (a)   us to reduce emissions.

After the storm, there was a thick layer of d (a)   covering the furniture.

To produce flour, you need to g (a)   the wheat into a fine powder.

Regular exercise and a balanced diet can help h (a)   your body.

It's important to i (a)   different teaching methods to cater to all learning styles.

he is one of the l (a)   scientists in the field of climate change research.

They had to r (a)   the proposal because it didn't meet the necessary criteria.