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 paragrap
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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
Where in the passage does the author compare the energy consumption of skyscrapers with that of a city
A．Lines 4 -6.
B．Lines 7 - 10.
C．Lines 12 - 14.
D．Lines 15 - 16.
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