Do you know why different animals or insects have their （1）

own

own

/??n/ colors？Because they can use different colors to keep themselves safe.
   Some birds feed on insects，but it's not easy for them to（2）

catch

catch

/k?t?/ locusts（蝗蟲）.Why？It is because locusts change（3）

their

their

（ they） colors together with the change of the colors of the crops.When crops are green，locusts look green.When crops are brown，locusts change to （4）

the

the

same color.Some other insects have to（5）

appear

appear

（ appear） only at night.It is because they have colors different（6）

from

from

plants and birds can find them and eat them.
   If you study the animal life，you'll find the main use of coloring is to protect themselves.Tigers，lions and other animals move quietly through（7）

forests

forests

（ forest）.The small animals cannot find them（8）

because

because

they have the colors much like the trees and grass.
   In the sea，there's a kind of fish with a soft body.It is not strong at all，but it can send out black liquid（液體） when it（9）

faces

faces

danger.While the liquid spreads（展開） over，its enemies（敵人） can't find it.And it（10）

quickly

quickly

/?kw?kli/ swims away.That's why we can still see it in the sea.