题目

Bob likes the camera very much because it can be to take pictures in cloudy or sunny conditions. A . adapted B . admitted C . adopted D . adjusted 答案：D指甲剪是常用的生活用具，它的刀刃做得很薄，目的是通过减小受力面积    压强（填“增大”或“减小”）．剪指甲时，图中AOB部分可以看成一个    杠杆（填“省力”或“费力”）