呈不规则的扁平块状，一面有多数圆形 * * 状突起的药材为
A．炉甘石B．赭石C．滑石D．自然钢E．信石
参考答案：B
作为地球的模型，地球仪应做成（ ）
A．
B．
C．
D．
Hardly ________ when the flood peak arrived.
A．they had left their village
B．they left their village
C．did they leave their village
D．had they left their village
