All life needs sunlight to live on. But only plants can use 41 directly(直接地). They make food from sunlight, water, air and so on. Animals can only use the sun’s energy 42 it has been changed into food by plants. Some animals feed directly on plants. Others eat smaller animals. Meat-eating animals are only 43 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 44 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 45 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.
36. A. alone B. lonely C. together D. happily
37. A. other B. the other C. another D. the others
38. A. for B. so that C. and D. in order to
39. A. any B. all C. some D. most
40. A. better B. broken C. stronger D. nicer
41. A. moonlight B. laser light C. sunlight D. bright light
42. A. after B. before C. until D. by the time
43. A. making B. catching C. eating D. feeding
44. A. sunlight B. animals C. plants D. people
45. A. can B. cannot C. must D. needn’t
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