题目

______ the question made her teacher angry and upset.    A. Jenny refuses to answer                      B. Jenny refusing to answer  C. Jenny’s refusing to answer                         D. Jenny’s refusing answering 答案:C我国首台载人潜水器将“接触”5000米深海,当其排开海水的体积为3米3时,受到浮力的大小约为_  _牛当其下潜至1000米深度时该处的压强约为      帕:该潜水器从1000米深处继续下潜,受到的浮力将   (选填”变大”、“不变”或“变小”)(海水的密度近似取:1×103千克/米3)
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