单项选择题

Generally speaking, the eastern American cities are (more) ______ than the western ones.

A．populous and industrialized
B．sparsely populated and agricultural
C．bigger and richer
D．smaller and poorer
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单项选择题
One of the most promising methods of storing hydrogen fuel is ______.
A．in gas form
B．putting it in liquid
C．preserving it in tanks
D．in the form of metal hydrides
单项选择题
Which of the following is the characteristic of hydrogen
A．It is nontoxic.
B．It has lots of vapour.
C．It doesn’t produce damaging fuels.
D．It costs less.
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