胎儿时，左右心房相通的孔是第二房间孔。
参考答案：错
16的平方根是[ ]
A．4
B．-4
C．±4
D．256
One reason for her preference for city life is that she can have easy to places like
supermarkets and hospitals.
A．chance
B．possession
C．access
D．gain
