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单项选择题

A．Charles DarwinB．Florence NightingaleC．Barbra Streizan……

Which of the following is NOT of British origin


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

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.