搬运装载有（）及用铁桶装的一级易燃液体时不得使用铁底板车辆。
A.氯化钠
B.氯化钾
C.氢氧他铁
D.氧化铝
参考答案：A, B
益母草的功效是（）
A.活血调经，利尿，清热通便
B.活血止痛，消瘕散结
C.活血调经，利水消肿，清热解毒
D.活血通经，凉血止血
E.以上都不是
The reason ____he had to look after his mother at hospital was not the one ____he gave to us.
A．why, why
B．that, which
C．why, that
D．that, why
