单项选择题

The main purpose of the passage is to ______.

A．compare skyscrapers with other modern structures
B．describe skyscrapers and their effect on the environment
C．advocate the use of masonry in the construction of skyscrapers
D．illustrate some architectural designs of skyscrapers

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单项选择题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.
D．Extra air-conditioning equipment is needed.

单项选择题Tile author raises issues that would most concern which of the following groups

A．Electricians.
B．Environmentalists.
C．Aviators.
D．Teachers.

单项选择题The author mentions people dying of air pollution in ______.

A．Illinois
B．Pennsylvania
C．New Jersey
D．Washington

单项选择题Scientists are trying to find a link between pollution and ______.

A．intelligence levels
B．antisocial behavior
C．birth defects
D．divorce percentage

单项选择题Scientists have not yet determined ______.

A．all of the effects of pollution on the human body
B．how pollution can be controlled successfully
C．when the atmosphere first became polluted
D．how to wash the black snow clean