Read the passage carefully then choose the correct answers

A. are contaminated

B. cannot be swum in

C. are dirty enough to swim in

D. are less dirty than they used to be

A. They have to cut down many trees.

B. They don’t take enough care of the countryside.

C. They have to pollute the air.

D. They have to wear oxygen masks.

A.  Because people cut down many trees.

B. Because there are large areas of land that can't be used.

C. Because there is too little rice.

D. Because many trees have been polluted.

A. being protected from natural environment

B. so rare that they can't survive

C. killed so many that they can't live in the forests

D. in danger from extinction

A. The Environment

B. Conservation

C. Save the Earth

D. Protect the nature