题目

Children are tired of learning often because they are __________ to do better than they can, both at school and at home.       A. suggested   B. expected     C. hoped D. helped 答案：B 解析: expect sb to do sth一根水平放置的圆柱形输水管道横截面如图所示，其中有水部分水面宽0.8米，最深处水深0.2米，则此输水管道的直径是（    ）A．0.4米            B．0.5米            C．0.8米        D．1米