animals are natural resources that people have wasted all through our history. animals have been killed for their fur and feathers, for food, for sport, and simply because they were in the way. thousands of kinds of animals have disappeared from the earth forever. hundreds more are on the danger list today. about 170 kinds in the united states alone are considered in danger.
why should people care? because we need animals, and because once they are gone, there will never be any more.animals are more than just beautiful or interesting. they are more than just a source of food. every animal has its place in the balance of nature. destroying one kind of animal can create many problems. for example, when farmers killed large numbers of hawks, the farmers stores of corn and grain were destroyed by rats and mice. why? because hawks eat rats and mice, with no hawks to keep down their numbers, the rats and mice multiplied quickly.
luckily, some people are working to help save the animals. some groups raise money to let people know about the problem. and they try to get the governments to pass laws protecting animals in danger. quite a few countries have passed laws. these laws forbid the killing of any animal or planton the danger list. slowly, the number of some animals in danger is growing.
美国习惯用语-第225讲:Like Greased Lightning
美国习惯用语-第226讲:Slow Burn/Slow As Molass
美国习惯用语-第221讲:As light as a feath
美国习惯用语-第218讲:get caught with one´
美国习惯用语-第187讲:make tracks
美国习惯用语-第211讲:stonewall
美国习惯用语-第217讲:Ups and downs
美国习惯用语-第174讲:All in the same boa
美国习惯用语-第191讲:pass the hat
美国习惯用语-第222讲:Know Which Side One´
美国习惯用语-第169讲:Nothing special
美国习惯用语-第202讲:One for the books
美国习惯用语-第190讲:at the drop of a&nb
美国习惯用语-第171讲:To whistle a different&n
美国习惯用语-第210讲:To climb the wall
美国习惯用语-第205讲:To walk on air
美国习惯用语-第201讲:Sunday best
美国习惯用语-第166讲:Out of the woods/Out&nbs
美国习惯用语-第183讲:Under the gun
美国习惯用语-第206讲:take a walk
美国习惯用语-第168讲:Whistle in the dark
美国习惯用语-第203讲:To close the books
美国习惯用语-第223讲:Bread and butter
美国习惯用语-第173讲:to keep one´s cool
美国习惯用语-第209讲:Wall-to-wall
美国习惯用语-第204讲:Bad-mouth
美国习惯用语-第207讲:motor mouth
美国习惯用语-第185讲:Full of beans
美国习惯用语-第188讲:stand someone up
美国习惯用语-第199讲:To be cut out for
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