Which of the following statements contains a metaphor？A．...U. S. consumption of petroleum
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Which of the following statements contains a metaphor？
A．...U. S. consumption of petroleum products remained relatively flat...
B．...to unlock oil previously trapped in layers of shale rock in states...
C．The White House sought to take credit for the figures.
D．The turnaround in U. S. oil fortunes has been rapid.
请帮忙给出正确答案和分析，谢谢！
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正确答案：B
修辞题。四个选项中，仅有[B]中的“unlock”和“trap”两个词使用了暗喻的修辞手法，将石油比喻成“被锁在”地下的物品，需要“解锁”，因此[B]为正确答案。[A]、[C]和[D]中的单词使用都是其本义，故均排除。