Natural gas didn’t become the leading fuel until According to paragraph 3, energy consumed in home heating over the next two de

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问题 Natural gas didn’t become the leading fuel until
According to paragraph 3, energy consumed in home heating over the next two decades will increase by

选项 A、33 percent.
B、31 percent.
C、21 percent.
D、14 percent.

答案D

解析
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