找出阅读的中心句All living things on the earth need other living thi

找出阅读的中心句
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 (食物链).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 (能量) 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 wheat,rice,vegetables,fruits and so on.We also eat meat and drink milk.But men often break up the food chains.They kill wild animals.They also 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. 女巫豆丁 1年前他留下的回答 已收到3个回答

ken307 网友

该名网友总共回答了13个问题，此问答他的回答如下：采纳率：92.3%

All living things on the earth need other living things to live.第一句即是主题句.这个句子概括了本段的中心意思,“地球上所有的生物要生存都离不开其它的生物”.后面讲述了大量的事实,“大部分动物必须成群的生活,甚至一种植物也要和其它同类的植物靠在一起生长.有时一种生物杀死另一种生物,一种生物吃另一种生物,而另一种生物被吃”.在列举了大量的事实之后,指出：如果这些食物链中的一个链环消失,所有的食物都会断掉.所有这些事实都是围绕第一个句子展开的.

1年前他留下的回答

1

l0lsk 网友

该名网友总共回答了5个问题，此问答他的回答如下：

All living things on the earth need other living things to live.
亲~标准答案啊
望采纳~

1年前他留下的回答

2

底娄 网友

该名网友总共回答了1个问题，此问答他的回答如下：

all food chains begin with the sun, and all food chains become broken up if one of the links disappears.

1年前他留下的回答

1

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