西周实行分封制的目的是[ ]

A．把土地和人口分给亲属、功臣等  

B．炫耀周天子的权力

C．巩固西周的统治                

D．让诸侯给周天子交纳贡品

根据句意及首字母提示填空。

1.The boy always _____ _____(犯错) in math.

2.It t_____(花费) us three hours to get to the top of the mountain.

3.The scientists finally s_____(发射) the man-made satellites into the space.

4.You have the r_____(责任) to protect your children.

5.Only you catch o_____(机会), you will be successful.