单项选择题

Those English language colleges that are not part of a university may be ______.

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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