问题补充：
Some of the heat near the surface of the earth electricity.
A. is used to making
B. are used for making
C. is used to make
D. are used to make
答案：
A. is used to making
B. are used for making
(答案→)C. is used to make
D. are used to make
解析：可联系答.案.网客服索取。
