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学霸导读 人类处于食物链中，却猎杀了许多野生动物。食物链中环环相扣，缺少一种动物会导致整个食物链出现问题。
We sometimes say the lion is “the king of the forest” because it is stronger and more dangerous than other animals. It is at the top of the food chain on l 1 . In the sea, the shark is at the top of the food chain. It can swim faster than most other sea animals. It can also catch other sea animals and eat them.
What is at the top of the world’s food chain? Human! We are not the biggest or fastest, but we are the c 2 . We invented cars so that we can move the fastest. We invented guns to hunt the animals. We are very clever to invent things,b 3 we can be dangerous, too. For example,many years ago in Inner Mongolia （内蒙古）, people used guns to k 4 a lot of wild wolves which usually eat wild rabbits. But in recent years, with the decreasing （减少） of the number of wild wolves, the number of wild rabbits is b 5 bigger and bigger. And the wild rabbits begin to compete （竞争） w 6 the sheep and cows for the grass. As a result, much of the grassland becomes desert because it is badly destroyed by the rabbits.
Remember that we are a part of the food chain, so we are in d 7 , too! If we protect animals, we protect ourselves.
1.___2.___3.___4.___5.___6.___7.___
chain
n.
链
invent
v.
发明
recent
adj.
最近的
as a result 因此
desert
n.
沙漠
destroy
v.
毁坏
protect
v.
保护