题目

物体放在水平地面上,下列属于一对作用力和反作用力的是:(   ) A.物体受到的重力和支持力        B.物体受到的支持力和地面受到的压力 C.地球对物体的引力和支持力      D.物体受到的重力和地面受到的压力 答案:B 解析: 略She was glad to see her children ______ in the nursery. A. good care of         B. well taken care C. well taken care of     D. good take care of  
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