Question

To keep our environment pollution free,what should we do?
(A) not let people cut tree.
(B) not use smokeless fuel in my kitchen.
(C) not use loudspeaker.
(D) not waste purified water.

Answer 1

most important is not people let cut tree( deforestation)

Answer 2

A) not let people cut tree
cause it it a main cause of deforestation ...