单项选择题

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

A．Electricians.
B．Environmentalists.
C．Aircraft pilots.
D．Teachers.
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单项选择题
The main purpose of the passage is to ______.
A．compare skyscrapers with other modem structures
B．describe skyscrapers and their effect on the environment
C．support the use of stone in the construction of skyscrapers
D．illustrate some architectural designs of skyscrapers
单项选择题
Where in the passage does the author compare the energy consumption of skyscrapers with that of a city
A．Line 4-7.
B．Line 13-16.
C．Line 18-21.
D．Line 22-24.
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