men are the cleverest and most dangerous animals on earth 。Rats come second 。Men kill their enemies。they have killed millions of men since ancient times--but rats have killed hundreds of millions of men。Rats carry diseases . Black rats carry fleas(跳子）。and these fleas give men bubonic plague (淋巴腺鼠疫).Bubonic plague still kills thousands of Asians and Africans today---as it killed millions of Europenas in the past.until brown rats came to Europe and pushed the black rats out.there is no piague in Europe.but brown rats carry thirty-five other diseases --typhus for example.Typhus(伤寒）has killed 200million people in the past 400 years.Rats are dangerous.They not only carry diseases into men's homes.but also take men's food.They eat 33 million tons of grain every year.That is enough grain to feed 200 million people--so men died of hunger because rats eat their food.Rats are clever.too.They have good leaders.Men try to poison them ,but if their leaders tell them that food is dangerous,they do not eat it. So our citis and villages are full of rats.We can go to the moon.but we cannot kill this dangerous enemy.Why? it is because we are not clean?
1.there are no black rats in Europe today because_____
A.they got plague in the Middle Ages
B.brown rats took their place
C.men killed them all with diseases
D.Europeans are cleaner than Asians or Africans
2.Rats are clever enoughto_____
A.know why food has got poison in it
B.kill me who are dangerous to them
C.eat food that has been poisoned
D.follow their good leaders' order
3.Inthe last 400 years,about how many people were killed by typhus each year?
A.200 million B.33 million
C.Half a million D.400 million
1.there are no black rats in Europe today because_____
A.they got plague in the Middle Ages
B.brown rats took their place
C.men killed them all with diseases
D.Europeans are cleaner than Asians or Africans
2.Rats are clever enoughto_____
A.know why food has got poison in it
B.kill me who are dangerous to them
C.eat food that has been poisoned
D.follow their good leaders' order
3.Inthe last 400 years,about how many people were killed by typhus each year?
A.200 million B.33 million
C.Half a million D.400 million
