单项选择题

A．broadeningB．narrowingC．meaning shiftD．class shiftThe ……

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 NOT of British origin

A．Charles Darwin
B．Florence Nightingale
C．Barbra Streizand
D．Hitchcock

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

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.

单项选择题It can be inferred from the passage that the Sun’s light travels ______.

A．through solid objects in space
B．in many different directions
C．more slowly than scientists previously believed
D．further in summer than in winter