题目

The course normally attracts 20 students per year, _____, up to half will be from overseas. A. in which    B. for whom   C. with which D. of whom 答案：D一个长5厘米，宽4厘米，高3厘米的长方体，截成两个形状，大小完全一样的长方体，表面积最少增加多少平方厘米？每个长方体的体积是多少立方厘米？