Withthedevelopmentofmodernagricultureandindustrypeopleareproducingmoreandmorewastethingsthatpolluteourearth.Asweknowwehaveonlyoneearth.Essentially（本来）freshwateronourearthislimited.Andnow

题目详情

　　With the development of modern agriculture and industry people are producing more and more waste things that pollute our earth. As we know we have only one earth. Essentially（本来） fresh water on our earth is limited. And now it's becoming less and less. We're destroying the earth and also ourselves!

　　For example as a result of pollution Lake Erie（伊利湖） on the borders（边界）of the USA and Canada is now without any living things.

　　Pollution in water is not simply a matter of “poisons” it is killing large numbers of fish overnight. Very often the effects of pollution are not noticed for many months or years because the first living things to be harmed are either plants or plankton（浮游生物）. But these are the food for fish and birds and other creatures. When this food disappears the fish and birds die too. It is not until dead fish and water birds are seen at the river's edge or on the seashore that people realize what is happening.

　　Where do the things which pollute the water come from? There are two main sources（来源）--waste water and industrial waste. As more detergent（洗涤剂）is used in the home more of it is finally put into our rivers lakes and seas. Detergents harm water birds by dissolving（分解）the natural things which keep their feathers（羽毛） waterproof . Waste water itself if it is not properly treated makes the water dirty and prevents all forms of life in rivers and the sea from receiving the oxygen（氧）they need. Industrial waste is even more harmful since there are many highly poisonous things in it.

　　So if we want to stop this pollution the answer is simple：waste water and industrial waste must be made clean before flowing into the water. It may already be too late to save some rivers and lakes but others can still be saved if the correct action is taken at once.

(1)Which of the following is the best title for this passage?

[　　]

A．Why Lake Erie Is Polluted

B．The Most Dangerous Pollution

C．Stop Polluting Water

D．How to Protect the Sea

(2)Pollution in water is noticed ________.

[　　]

A．when the first living things in it are harmed

B．when a good many fish and water birds die

C．as soon as waste water is poured into it

D．as soon as plants and plankton disappear