单项选择题

A．It’s not easy to recommend her a university.
B．A large good university is good in every field.
C．Some universities have their own special fields.
D．It’s not good to go to only one university.
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The passage mentions ______ obstacles that stand in the way of energy conservation.
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Developing alternative energy sources is the most effective method to cope with energy problems both in the short and long terms.
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