原题
录音 1
What does the speaker mean when she calls wetlands "biochemical powerhouses"?
AWetlands clean the air by absorbing carbon dioxide and releasing oxygen.
BThe volume of water passing through some wetlands could power a factory.
CMicrobial communities in wetlands serve to filter water on a massive scale.
DToo much wetland has been destroyed for industrial and commercial use.
正确答案：C
解题思路
老师暂未填写解题思路。