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32.What's the function of the sensor? A.To test chemicals in plants. B.To help plants survive drought. C.To find out plants'lack of water. D.To measure the speed of water moving in plants. 33.How will plants react when the soil is dry? A.Close holes in their leaves. B.Slow the flow of water in them. C.Store more water in their leaves. D.Give off more water vapor. 34.What is Elizabeth Lee's attitude to the study? A.Doubtful. B.Positive.