单项选择题
Those English language colleges that are not part of a university may be ______.
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A.operated privately
B.operated by the government
C.part of government technical and business colleges
D.all of the above
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单项选择题
According to this passage, Environmental Protection Agency ______.
A.is the only agency studying the effects of air pollution on health
B.has launched a surprised attack on researchers
C.has decided to decrease the permitted concentration of airborne dust
D.has tremendously improved pollution control
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单项选择题
According to the passage, the age range of some businesses’ customers may be limited because of ______.
A.social/cultural factors
B.economic factors
C.legal/political factors
D.factors of state
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