小土屋

    小路边那座小小的土屋，不知经过多少年的风风雨雨，已经破烂不堪。路上的行人从来不会注意那座小小的土屋。

    雨，下起来了，越下越大，路上的行人惊奇地发现了路边那座破烂的小屋，便一头钻进去了。一会儿，小小的土屋越来越吵，越来越①挤，越来越闷。

    “这小屋应该修一修了。”

    “对呀，人们可以在这儿避雨了。我们改天来修吧!”

    “这间土屋再修大些，修好些就好了。”

    ……

    雨，刷刷地下着，像牛毛，像花针，像细丝，渐渐地小了、小了。终于，雨停了。人们争先恐后地②挤出了小土屋，说着、笑着走了……

    小土屋默默地、静静地立在路边，这条小路又渐渐地静了、静了……

    小路边，那座小小的、不起眼的小土屋，不知经过了多少年风吹雨打，更加破烂不堪了。行人还是那样的走了，一切，还是如旧……

如图，一个圆柱和一个圆锥的底面直径和它们的高都与一个球的直径相等，这时圆柱、圆锥、球的体积之比为____ 

    People in the West didn't know coffee or tea two hundred years ago. They were 1 to drink them because they thought coffee or tea could kill a person. Once the king of England decided to find out 2 it was true.

    There were two brothers in prison(监狱) at that time.They would be killed 3 a few days because they did wrong. The king said, "I shall let them live but they must drink coffee or tea to the end of their lives. One brother must drink coffee and 4 must drink tea every day." And they followed the king's words.

    They both lived many years. At last, the elder brother died when he was eighty-three years old.The younger one died a few years later. After that, people 5 that coffee and tea were not bad to man.

利用金属晶格（大小约10^﹣10m）作为障碍物观察电子的衍射图样，方法是让电子通过电场加速，然后让电子束照射到金属晶格上，从而得到电子的衍射图样．已知电子质量为m、电量为e、初速度为零，加速电压为U，普朗克常量为h，则下列说法中正确的是（）