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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We can conclude that ______.
A. civilization may be doomed if pollution is not controlled
B. pollution is more serious in Europe than it is in America
C. most people do not know that pollution is a serious problem
D. black snow is not so serious compared with white snow
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
世界银行贷款项目采购程序的主要程序是( )。
A. 国际竞争性招标
B. 国内竞争性招标
C. 邀请招标
D. 询价
Scientists are trying to find a link between pollution and ______.
A. intelligence levels
B. antisocial behavior
C. birth defects
D. divorce percentage
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