单项选择题

The word bird used to mean "young bird"; today it means "any kind of bird". This is called ______ in terms of semantic change.

A．broadening
B．narrowing
C．meaning shift
D．class shift
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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.
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
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