完形填空(本大题有10小题。每小题1分，共10分)
通读下面短文，掌握其大意，然后在各小题所给的四个选项中，选出一个最佳答案。将其字母编号填写在答卷相应题目的答题位置上。若用答题卡答题，则将答题卡上对应是目所选的选项涂黑。
All living things on the earth need other living things to live with. Nothing lives      . Sometimes one living thing kills         . Each kind of life eats another kind of life         live, and together they form a food chain(食物链). Some food chains are simple, while others are not. But         food chains begin with the sun, and all food chains become         if one of the links disappears.
All life needs sunlight to live on. But only plants can use        directly(直接地). They make food from sunlight, water, air and so on. Animals can only use the sun’s energy         it has been changed into food by plants. Some animals feed directly on plants. Others eat smaller animals. Meat-eating animals are only     plants indirectly.
What about human beings? We are members of many food chains. We eat wheat, rice, vegetables, fruit and so on. We also eat meat and drink milk. But       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        be eaten. If people eat the fish, they will get strange diseases.
Each form of life is linked to all the others. Breaking the links puts all life in danger.

A．alone B．lonely C．together D．happily

A．other B．the other C．another D．the others

A．for B．so that C．and D．in order to

A．any B．all C．some D．most

A．better B．broken C．stronger D．nicer

A．moonlight B．laser light C．sunlight D．bright light

A．after B．before C．until D．by the time

A．making B．catching C．eating D．feeding

A．sunlight B．animals C．plants D．people

A．can B．cannot C．must D．needn’t