“封建亲戚，以藩屏周。”说明西周时期实行分封制的主要目的是[ ]

A．分割诸侯的兵力

B．保证国家的兵源

C．巩固周王的统治

D．保证国家财政收入

---- You’re coughing badly, Martin．Why not give up smoking?

---- Give up smoking? Easier said than done, Amy．Once you _____ the habit of smoking, it is very hard for you to______．

A．keep up; break it away

B．take up; drop it out

C．pick up; get rid of it

D．build up; do away with it