ENVIRONMENTAL...IS A SERIOUS PROBLEM FACING MANKIND TODAY. A. POLLUT...

9. - DE KT HK2 - AV9 - 2009-2010 (CO DAP AN)
DE KT HK2 - AV9 - 2009-2010 (CO DAP AN)

9.Environmental...is a serious problem facing mankind today.

A. polluted

B. pollution

C.pollute

D. polluting