某生物研究小组的同学要为环保部门提供某地有关环境污染的报告，他们应采取下列哪种方法来了解此处的环境状况（）A．观察法B．调查法C．实验法D．模拟法-七年级生物

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• Paul doesn't have to be made. He always works hard,[ ]A. learnB. to learnC. learningD. learned-
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