题目

在显微镜中，可以使镜筒明显上升下降的结构是 （     ） A.细准焦螺旋        B.粗准焦螺旋       C.转换器          D.载物台 答案：B— Did you forget about my birthday? — ________ I've booked a table at Michael's restaurant for this evening. [     ] A. So what?B. I'm afraid so.C. How could I?D. For sure.