填空题

A over the past 50 years
B beneath the earth surface
C by more than 50 percent
D for more than four decades
E as a raw material
F for families
Natural gas is stored deep______.

【参考答案】

B
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填空题
Paragraph 2______
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The fault, which was overlooked before, has been closely studied by scientists.
A．Right.
B．Wrong
C．Not mentioned
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