单项选择题

Natural gas is stored deep（）．

A．over the past 50 years
B．beneath the earth’s surface
C．by more than 50 percent
D．for more than four decades
E．as a raw material
F．for home energy needs

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热门试题

单项选择题

Many countries will grant permission for the use of space-based solar power soon．（）

A．Right
B．Wrong
C．Not mentioned

单项选择题

Space-based solar power will rule out other forms of renewable energy sources．（）

A．Right
B．Wrong
C．Not mentioned