题目

—Professor Johnson, I'm afraid I can't finish the report within this week.     —________ How about next week? A．Good for you.  B．It won't bother me.  C．Not at all.   D．That's OK. 答案：D下列物体中质量约为2×105mg的是（ ）A. 一枚图钉 B. 一册九年级物理课本C. 一张学生课桌 D. 一把木椅