WE ARE TALKING ABOUT THE PRESERVATION OF ______________ RESOURCES....

6. - DE THI HK 2 CO DAP AN TIENG ANH 9 DE THI HOC KY 2 CO DAP AN
DE THI HK 2 CO DAP AN TIENG ANH 9 DE THI HOC KY 2 CO DAP AN

6. We are talking about the preservation of ______________ resources.

A. nature B. natural C. naturally D. naturalize