A deep hole was dug so that ________ . 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<br/>pile

The little princess thought that the big rats and snakes are _______.

There are no black rats in Europe today because ______ took their places.

Such vermin as bugs and rats （is, are ）hard to get rid of.

In one year rats eat 40 to 50 times __________ weight.

Rats aged 1, 2, 12, 18 and 24 months were ( ) by decapitation.

What did most people do when the city office first ordered them to kill rats A: They were too lazy to kill rats. B: They killed nearly all the rats very quickly. C: They stole dead rats.

In some cultures, rats and butterflies are considered perfectly ______ while in other cultures, they are considered inedible.

The chemical is lethal to rats but safe to cattle. A: toxic B: harmful C: deadly D: contagious

The chemical is deadly to rats but safe to cattle.() A: fatal B: hateful C: good D: useful