Napoga  is a 12—year---old  girl in Ghana, Africa. It is hard for her family to get clean water . Every morning , she leaves home at half past five to get clean water for her family in a village far away . It takes her six hours to get enough clean water for daily cooking and drinking. She has no time to go to school or to play with her friends. Millions of people in the world are like Napoga . They can’t get enough clean water to keep healthy.
Earth Day is April 22. But on all other days, we must also remember it. The water we use is the most important natural resource(自然资源)on the earth.
Water covers 70 perent of the earth’s surface (表面). But most of that is sea water. We can’t use it for very many things.  Fresh water covers only one percent of the earth’s surface.
You probably feel lucky that your life isn’t as hard as Napoga’s . But that doesn’t mean you don’t have to worry about water. We all face serious water problems. One of them is water pollution. All kinds of things from cars, factories, farms and homes make our rivers , lakes , and oceans dirty. Polluted water is very bad for people to drink. And dirty water is bad for fish , too. Now, thirty-four percent of all kinds of fish are dying out.
How do cars and factories make our water dirty? First, they pollute the air. Then , when it rains, the rain water comes down and makes our drinking water dirty. Dirty rain, called acid rain(酸雨), is also bad for plants ,animals and buildings.
Scientists say that in 30 years, more than half of the people in the world won’t have enough clean water. We have to learn how to save more water for ourselves  and our children. Here is some advice for saving water:
● Turn off the water while you brush your teeth. You can save as much as 450liters(升)each month.
● Leaky taps （漏水的龙头）waste a lot of water. Fix them right away.
●You can easily cut your 10—minute showers in half---and you’ll be just as clean.
●When you wash dishes, don’t let the water run.
●Only wash clothes when you have a lot to wash. If your washing machine isn’t full , you are wasting water!
根据材料内容，选择最佳答案，并将其标号填入题前括号内。
小题1:Every morning Napoga went to get clean water _________.

A．before she went to school

B．after she finished school

C．without going to school

D．after she played with her friends

小题2:On the earth, _______________.
sea water is  more widely used than fresh water
B.there is very little water for our living
C.there is 71 percent of fresh water
D.we don’t need to worry about water
小题3:Acid rain____________________________.

A．is only bad for living things.

B．can be produced in factories

C．doesn’t do harm to people , but it’s bad for plants, animals and buildings.

D．doesn’t just do harm to human beings but to animals, plants and buildings.

小题4:Which of the following wastes water?

A．We need ten minutes if we want a clean shower.

B．We should put in enough clothes when we wash them in washing machines.

C．You can keep yourself clean by having a shower for five minutes.

D．Don’t let the water run when we brush our teeth and wash dishes.

小题5:What’s the main idea of the passage?____________.

A．Something must be done to prevent water from being polluted.

B．Clean water means much to human beings and living things around us.

C．It’s time to take care of the water we use.

D．Water is the most important natural resource on the earth.

What do people do with their old, out of date but still useful computers? Most people don’t know how to deal with them. Many old computers are put away. Many more are simply thrown away as rubbish.
Finally, some companies are thinking of ways to bring down the number of old computers. Sony has agreed to help recycle old Sony products（产品）. Dell, Hewlett Packard and other companies now also take back some old computers of their own brands.
In some countries, laws have been passed, too. Computer companies have to pay for collecting and recycling their used products. And 70% of computer waste must be recycled. The idea behind the laws is that computer companies themselves should pay for the cost. That will encourage them to make computers which are easier and cheaper to repair and upgrade（升级）.
Yet many people are throwing away good computers, while others cannot afford them at all. Hundreds of organizations are working on this problem. They collect and repair old computers. Some also teach others how to repair computers. These repaired computers then go to schools, charities（慈善团体) or people who need them. Giving a used computer to one of these organizations can turn one person’s rubbish into someone else’s useful things and cut down waste, too.
根据短文内容，选择正确答案。（10分）
小题1:What do many people do with old computers?
A．They sell them.  B．They send them to others.    C．They stop using them.
小题2:How many computer companies are mentioned in the second paragraph?
A．One.             B．Two.                 C．Three.
小题3:According to the laws in some countries, computer companies must       .
A．recycle most of their products
B．collect all their used products
C．make more cheaper computers
小题4:What do the organizations do to solve the problem of old computers?
A．Help the computer companies to collect them.
B．Repair and send them to those who need them.
C．Help people to learn to use them.
小题5:What is the main idea of this passage?
A．Repairing old computers.
B．Encouraging to make cheap computers.
C．Recycling old computers.