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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热门试题

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

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