血液与组织细胞之间进行物质交换的场所是[ ]
A．动脉
B．动脉或静脉
C．静脉
D．毛细血管
答案：D
______ the danger from wars, people had to deal with a shortage of food, clothing, fuel and almost everything.
A．In spite of
B．Instead of
C．As long as
D．As well as
实现行政职能的行政手段具有垂直性和无偿性的特点。 ( )
