题目

I am struggling to polish up my English now. If only I _______ hard in senior one! A . study B . studied C . had studied D . should study 答案：C如图1所示，在用横截面为椭圆形的墨水瓶演示坚硬物体微小弹性形变的演示实验中，能观察到的现象是（  ）A.沿椭圆长轴方向压瓶壁，管中水面上升；沿椭圆短轴方向压瓶壁，管中水面下降B.沿椭圆长轴方向压瓶壁，管中水面下降；沿椭圆短轴方向压瓶壁，管中水面上升C.沿椭圆长轴或短轴方向压瓶壁，管中水面均上升D.沿椭圆长轴或短轴方向压瓶壁，管中水面均下降