直达运输与中转运输相比较，______。
A．成本节省
B．运输速度快
C．托运手续简单
D．两者的优劣要具体分析
参考答案：D
To save class time, our teacher has _____ students do half of the exercise in class and complete the other
half for homework. [ ]
A. us
B. we
C. our
D. ours
老年人便秘的特点是（）
A.大便量少，干硬
B.大便量多
C.多属器质性便秘
D.一般每周大便少于5次
E.多因药物所致
