单项选择题

A．populous and industrializedB．sparsely populated and a……

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

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热门试题

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.

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.