单项选择题

It is estimated that by 2025 the natural gas demand in the United States will increase（）．

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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单项选择题

52（）

A．in spite of
B．because of
C．as a result of
D．such as

单项选择题

What does the state-of-the-art computer simulation tell us about（）

A．How the Big Bang occurred about 13 billion years ago．
B．How“cosmic dark ages”came into existence．
C．How dust grains and gases were formed after the Big Bang．
D．How the first stars came into being after the Big Bang．