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
What does the passage mainly discuss
A．The production of solar light and heat.
B．The physical and chemical nature of life.
C．The conversion of Hydrogen to helium.
D．Radiation in the X - ray part of the spectrum.
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