试从南北朝的实际情况分析佛教、道教流行的原因。

完形填空（本题共10小题，每小题2分，共20分）
Once a man wanted to go 　 1 　 one side of a river to　 2 　 in a boat. He　 3 　 take　 4 　 him a sheep, a wolf and a basket of vegetables. But he could take only one of them　 5 　, because the boat was very　 6 　. “If I　 7 　 the wolf and the sheep together, the wolf may eat the sheep,” he said to　 8 　.“If I leave the sheep and the vegetables together, the sheep may eat the vegetables.” He thought and thought. At last, he had an idea. And he　 9 　 able to get to the other side of the river with the sheep, the wolf, and the vegetables. Do you know 　 10 　?

小题1:	A．on　　 B．in　　 C．from　　 D．with

小题2:	A．another 　 B．the other　 C．others 　 D．other

小题3:	A．had to 　　 B．has to　　 C．have to 　　 D．must

小题4:	A．after　　 B．with　　 C．about 　　　 D．up

小题5:	A．once a time B．at time　　　 C．in time D．at a time

小题6:	A．large　　 B．big　 C．small 　　 D．beautiful

小题7:	A．will leave B．left　 C．leave　 D．have left

小题8:	A．oneself　　 B．myself　 C．itself　　 D．himself

小题9:	A．was　　 B．is　　 C．be 　　 D．can

小题10:

A．how did he it B．what did he it C．how did he do it D．how he did it