All living things on the earth need other living things to live.Nothing lives alone.Most animals must live in a group，and even a plant grows close together with others of the same kind.Sometimes one living thing kills another，one eats and the other is eaten.Each kind of life eats another kind of life in order to live，and together they form a food chain.Some food chains are simple，while others are not.But all food chains begin with the sun，and all food chains become broken up if one of the links disappears.
       All life needs sunlight to live on.But only plants can use sunlight directly.Plants are "factories".They make food from sunlight，water and things in the soil and air.
       Plants feed all other living things.Animals can only use the sun's energy after it has been changed into food by plants.Some animals feed directly on plants，others eat smaller animals.Meat-eating animals are only eating plants indirectly.
       What about human beings？We are members of many food chains.We eat rice，vegetables，fruits and so on.We also eat meat and drink milk.But men often break up the food chain.They kill wild animals and make rivers，lakes and seas dirty.When these rivers，lakes and seas are polluted，the fish in them can not be eaten.If men eat the fish，they will get strange diseases.
       Each form of life is linked to all others.Breaking the links puts all life in danger.

閱讀短文，根據(jù)英文釋義及首字母提示拼寫單詞。
（1）s

imple

imple

easy to understand
（2）c

hange

hange

to become different
閱讀短文，完成同義句轉(zhuǎn)換，每空一詞。
（3）Each kind of life eats another kind of life in order to live，
Each kind of life eats another kind of life

so

so

that

that

they can live.
根據(jù)短文內(nèi)容回答問題。
（4）Can living things on the earth live alone？

No，they can't.

No，they can't.

（5）Where do all the food chains begin with？

All food chains begin with the sun.

All food chains begin with the sun.

（6）How many kinds of living things are mentioned in the passage？

Three.

Three.