5．
阅读理解
We sometimes say the
lion is "the king of the jungle" because it is stronger and more
dangerous than the other animals. It can run faster than most other animals and
it can hunt better. The lion is the highest animal in the land food chain. 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 use its big teeth to catch other sea animals and
eat them.
What is at the top of
the world's food chain? Humans are! We are not the biggest or fastest, but we
are the cleverest. We could not run faster than most animals, so we invented
cars and now we can move the fastest. We could not fight better than lions, so
we invented guns. Now we can hunt the best.
People's inventions are
clever, but they can be dangerous too. For example, many years ago, in Inner
Mongolia, people used guns to kill a lot of wild wolves. The wild wolves
usually eat wild rabbits. But in recent years, the number of wild rabbits is
becoming bigger and bigger because the a number of wild wolves is getting
smaller and smaller. The wild rabbits competed for the grass with the sheep and
cows. Much of the grassland became desert because it was seriously destroyed by
the rabbits.
Remember that we are a
part of the food chain, so we are in danger too! If we protect animals, we are
protecting ourselves.
