萃取溶液和溶剂倒入分液漏斗后不能超过漏斗容积的（）。
A.2/3
B.1/3
C.1/4
D.1/2
参考答案：A
在平面直角坐标系中，点A（-3，-1）关于y轴的对称点的坐标为______．
I can still vividly remember to pick our steps in the mountain down the deep valley on my 21st birthday.
A．picking ... in the mountains
B．picking ... on the mountain
C．having picked ... from the mountains
D．picking ... from the mountains
