单项选择题

The author raises issues that would most concern which of the following groups

A．Electricians.
B．Environmentalists.
C．Aviators.
D．Teachers.
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According to the passage, what is one disadvantage of skyscrapers that have mirrored walls
A．The exterior surrounding air is heated.
B．The windows must be cleaned daily.
C．Construction time is increased.
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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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