煤层（组）顶板冒落带、导水裂隙带范围内分布有富含水层，必须进行疏降开采。
参考答案：对
— Your aunt often walks the dog in the morning.
— Yeah, bad weather stops her.
A．when
B．unless
C．because
D．since
具有凉血止血，解毒敛疮功效的药物是（）
A.地榆
B.蒲黄
C.白茅根
D.槐花
E.大蓟
