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
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.
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