WE SHOULD USE COAL, OIL AND GAS ...A. AS ECONOMICALLY AS POSSIBLE B...

4. - GIÁN ÁN UNIT 10: CONVERVATION
GIÁN ÁN UNIT 10: CONVERVATION

4.

We should use coal, oil and gas ...

A. as economically as possible

B. carelessly

C. as much as possible

D. all are incorrect