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   We sometimes call the lion "the king of the jungle"because it is stronger and more dangerous than other animals．It can run （1）

faster

faster

（fast）than many animals and it can hunt the best．It is the top animal in the （2）

land

land

[l?nd] food chain（食物鏈）．
   In the sea ，the shark is one of the animals at the top of the food chain．It can swim faster than almost other sea animals ，and it can use its big （3）

teeth

teeth

（tooth） to eat them．
   What is at the top of the world's food chain ？People are!We are not the biggest or faster，（4）

but

but

we are the cleverest．We could not （5）

run

run

faster than cheetahs （獵豹），so we invented cars and now we can move the faster．We could not fight better than lions ，so we （6）

invented

invented

guns．People's inventions are clever ，but they can be（7）

dangerous

dangerous

[?de?nd??r?s] too．For example ，people invented factories ，and now they make the air and rivers （8）

dirty

dirty

．Dirty rivers kill fish．When bears cannot eat the fish and the bears die．If we kill one part of the food chain ，other parts also die．（9）

Remember

Remember

[r??memb?（r）]that we are a part of the food chain ，so we are in danger too !If we（10）

protect

protect

animals ，we are protecting ourselves !