题目

We__________ listen to her CDs, because they are too bad. A . not B . doesn't C . can't D . don't 答案：D转动细准焦螺旋时，显微镜A.镜筒迅速上升B.镜筒迅速下降C.没有任何变化D.镜筒在极小的范围内升降