单项选择题

The main purpose of the passage is to ______.

A．compare skyscraper's 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 neede

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