（牛顿市）
Today Newton is a very clean place.Many years ago,however,there were millions of rats in it.They attacked the cats and dogs.Sometimes a great number of them knocked
down a man or woman walking home at night.The rats were very large in size and they harmed many people.
They goverment ordered everybody to kill rats.Most people were lazy,so they didn’t kill many.The goverment promised to pay some money for each dead rat.The made the
people very happy.They killed thousands of rats everyday.A goverment officer put all the dead rats in a big pile.Sometimes a man brought hundreds in one day.
After two weeks there were not many rats in the city,but people still brought many rats to the goverment office.The goverment officer thought that people were stealing dad
rats from the pile.He ordered his mean to dig a deep hole and put the rats in it.Soon there were no mroe rats,and the goverment didn’t pay any more momey.
如今牛顿市是一个非常干净的地方。然而，很多年前，那里有上百万只老鼠。它们袭击猫狗。走夜路回家的人中，无论男女，也经常有人被一大群老鼠撞到。
那些老鼠个头很大，是很多人受伤。
政府下令每个人都要灭鼠。大多数人很懒，所以灭掉的不多。政府许诺会为每只死老鼠付赏金，这让人们很兴奋。每天人们灭掉成千上万只老鼠，一名政府工
作人员将死老鼠堆成一大堆。有时一个人一天就带来百只死老鼠。
两周后，城里就没有很多老鼠了。但人们仍然将大量死老鼠带到政府工作人员那里。他认为有人在从老鼠堆里偷死老鼠，于是命令输下挖一个深坑，将死老鼠

丢进坑里。很快那里就没有老鼠了，政府也不用再付赏金了。A deep hole was dug so that.挖深坑的目的是.

A.the rats couldn’t come out to attack people at night.

B.people could take rats from it easily

C.people would kill more rats

D.nobody could take any rats from the pile没有人能从死老鼠堆里拿走老鼠