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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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 sentence proves that setting the giant reflector is a delicate operation
A．The first sentence in the last paragraph.
B．The second sentence in the last paragraph.
C．The last sentence in the last paragraph.
D．The last sentence in the third paragraph.
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