题目内容
A bad eating habit will not kill people at once. It can, _______, cause many diseases.
A. though B. but C. however D. because
C 【解析】句意：不好的饮食习惯将不会马上杀死人。然而，它能导致很多疾病。though尽管；but但是；however然而；because因为。结合句意，前半句表示不好的饮食习惯无法杀死人，后半句表示它能导致很多疾病，前后表示转折关系，此处有逗号隔开，故用however，故选C。
阅读理解
(2014泸州)
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，or one eats and the other is eaten．One kind of life eats another kind of life in order to live，and together they form a food chain(食物链)．All food chains begin with the sun，and all food chain become broken up if one of them 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，and others eat smaller animals．Meat－eating animals are only eating plants indirectly．
What about human beings？We are members of any food chain．We eat rice，vegetables，fruits and so on．We also eat meat．But men often break up the food chain．They kill wild animals．They also make rivers，lakes and seas dirty．When these rivers，lakes and seas are polluted，the fish in them cannot be eaten．If men eat the fish，they will get strange diseases．
Each form of life is linked(联系)to all others．Breaking the links puts all life in danger．
1.Food chains suggest that________．
A．every life needs food
B．plants are very important
C．no living thing can live alone
D．1iving things need different food
2.From the text we can learn that the sun________．
A．forms a food chain
B．makes animals to grow fast
C．is the beginning of food chains
D．is directly giving us different food
3.What do plants need to grow up？
a．living things b．soil c．water d．sunlight e．things in the air |
A．a；b；c；d
B．b；c；d；e
C．a；b；d；e
D．a；c；d；e
4.Which can change the sun’s energy into food？
A．Plants．
B．Humans．
C．Plant－eating animals．
D．Meat－eating animals．
5.The writer is trying to tell us not to________．
A．kill animals
B．break the links of life
C．worry about food chains
D．eat fish from polluted water
1.C 2.C 3.B 4.A 5.B 【解析】 1.“All living things on the earth need other living things to live．Nothing lives alone．”可知答案为C。 2.“All food chains begin with the sun…”可知答案为C。 3.“Plant...
