问题
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Lichens. probably the hardiest of all plants, live where virtually nothing else can---not
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听力原文:(A) These trees are ready for planting. (B) The truck and trailer are full of log
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How can time-lapse photography be made to demonstrate the living organism of plants?A.A se
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Why are some people not in favor of the campaign?A.Because tobacco addicts can be easily i
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Why are early accounts of folk customs unreliable?A.Because the participants did not revea
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The reason why people put on weight at work is thatA.people"s living standards are improve