在探究温度对鼠妇生活影响的实验中，实验组和对照组都应该保持相同的条件是（）A．光、温度、湿度等B．鼠妇数量、光、温度等C．温度、湿度、鼠妇的数量等D．空气、湿度、光等-生物

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• Where ______ they ______ on vacation? [ ]A. did; visit B. was; visit C. does; visit D. is; visiting
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• About seventy percent of the earth with water.A．is coveringB．is covered C．are coveringD．are covered-
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