单项选择题

The challenge we are facing in this century is to find new means of controlling energy.

A) 本世纪我们面临的挑战是寻找新的控制能源的方法。
B) 寻找新的控制能源的办法是我们本世纪要面临的挑战。
C) 为了面对本世纪的挑战，必须找到能源的管理办法。
D) 本世纪中人们对能源控制的办法是我们面临的挑战。
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