单项选择题

According to the author, _________.

A．people benefit from universities but do not value them
B．universities have lost their sense of purpose
C．people value universities but are hesitant to support them
D．universities are no longer effective in producing good graduates

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单项选择题It is implied in the second paragraph that _________.

A．clear air is necessary for people's health
B．we don't have to worry about future developments
C．we should control overexploitation of the nature
D．people can produce more energy to meet industrial demands

单项选择题In the second paragraph, the author uses the word self-sufficiency to mean that _________.

A．economic development damages our future
B．we should return to the productive mode in the past decades
C．people uses their own things rather than borrowing from others
D．we must reduce the environmental cost of economic development