They are putting too much carbon dioxide into the atmosphere, prevents heat from escaping from the earth into space.
A. what
B. that
C. which
D. who
网友回答
A. what
B. that
(答案→)C. which
D. who
解析：本题考查定语从句。Which引导非限制性定语从句，代指前面的一句话。句意：他们把太多的二氧化碳排到大气中，阻止了热从地球逃逸到太空中。