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第1题

The problem _____ pollutiorequires the immediate attentioby government leaders as well as scientists and environmentalis
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第2题

What does the author say about people's sleeping habits
·They are culture－related.
·They affect people's h
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第3题

Indoor heating systems have made __ _____ for people to live and work comfortably ia mild climate. make it possible for
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第4题

What is the most probable reasofor some rich people to use a device to record their sleeppatterns
·They have trouble
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