单项选择题

One benefit the author mentions is that the system______.

A．uses no electricity
B．has a fire-safety shutoff
C．does not pollute the air in the house
D．pollute the air in house
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单项选择题
One of the reasons for the current crisis in American colleges and universities is that______.
A．a narrow vocationalism has come to dominate many colleges
B．students don' t have enough freedom in choosing what they want to learn
C．skills are being taught as a means to an end
D．students are only interested in obtaining credentials
单项选择题
American colleges and universities failed to graduate half of their four-year degree candidates because
A．most of them lack high-quality faculties
B．the interests of most faculty members lie in research
C．there are not enough incentives for students to study hard
D．they attach greater importance to research and publication than to teaching
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