Many places in the world need more fresh water. Every country is trying to find ways to turn salt water into...

题型：阅读选择题类：常考题难易度：普通

    Many places in the world need more fresh water. Every country is trying to find ways to turn salt water into fresh. Why aren't there many factories like the Symi factory?
    In some places the sun is not hot enough. Or it does not shine every day.
    In such places other ways of heating sea water can be used. These ways cost more money, but they work faster than the sun. By boiling sea water with high heat a lot of fresh water can be made quickly.But heating is not the only way to get fresh water from salt water. Other ways are tried.
    One way is freezing. The fresh part of salt water freezes first. To get fresh water, the bits of ice are taken out.
    Which way is the best? The one that gives the most water for the least money. It may be a different way for each place.
Symi's way seems very good for small, hot places. It does not make much water at a time. But the factory is easy to build and costs little. That is why people in many dry places talk about Symi.

（1）、From the passage we know that fresh water _____________.

A、is needed in many countries B、is needed in every country C、can be used in many ways D、is very important for factories

（2）、The Symi factory __________.

A、turns salt water into fresh B、can be built everywhere C、can make much fresh water at a time D、doesn't need sunshine every day

（3）、Which is the best way for small and hot places to get fresh water?

A、Boiling the sea water. B、Heating the sea water. C、The Symi's way. D、Freezing the sea water.

（4）、What fact doesn't the passage mention (提到)?

A、New ways of getting fresh water. B、A lot of fresh water can be made quickly by heating. C、The best way is to get the freshest water with the least money. D、The Symi's way doesn't work in dry places.

（5）、The Symi's way is not suitable for _________ places according to the passage.

A、small B、hot C、cool D、dry

举一反三

    A study finds that not enough morning light causes teenagers not to get enough sleep at night. “As teenagers spend more time indoors, they miss necessary morning light. Day light is needed to keep the balance of the body's 24-hour biological system (生物系统), which regulates (调节) body temperature and sleep styles,”reports Dr. Mariana Figueiro. “These teenagers who receive little morning light are going to bed later, getting less sleep and doing badly in tests. They are more likely to fail in their exams.”
    In the study, Dr. Figueiro asked 11 students in Grade 8 to wear special glasses to prevent blue morning light from reaching their eyes. At the end of the 5-day study she found that they fell asleep 30 minutes later than usual.
    Throughout her research, Dr. Figueiro has been very worried about teenagers going to bed too late. The problem is that today's schools require teenagers to be in school very early in the morning. These students are likely to miss the morning light because they often go to school before the sun is up or as it's just rising.
    Furthermore (此外), the schools are not likely to provide enough electric light to keep the balance of this biological system. Our biological system is much more sensitive (敏感的) to blue light. Therefore, having lots of light in the classroom does not make sure that there is enough light to keep our biological system balanced.

     When you look up into the sky at night, have you ever felt that your eyes are playing tricks on (捉弄) you? It seems that the stars are moving all the time.
      Actually, there is nothing wrong with your eyes. This twinkling effect is called scintillation (交光). Scintillation happens because of air movements in the earth's atmosphere (大气). Light is “bent (弯曲的)” when it travels through different parts of the earth's atmosphere. As the air in the earth's atmosphere is moving all the time, the light from the stars looks as if it is moving too.
    The same thing also happens to things on the ground. On a very hot and shiny day, if you look at the road, the image in the distance is not clear and things move slightly. You can also see the same effect if you drop a rock into water. The rock appears a little unclear under the moving water.
      This twinkling effect causes a lot of problems for astronomers (天文学家) since they cannot observe the stars clearly. A telescope (望远镜) was sent into space so that the air movements in the atmosphere could be avoided (避免). It took a long time to build the space telescope but finally in 1990, a huge space telescope called the Hubble Space Telescope was successfully sent into space. Since then, astronomers have many important observations that have helped people understand space better.
根据短文内容，选择最佳选项。

    Today there are 6.4 billion people on the earth. By the year 2050 there may be 12.5 billion . There are a lot of people to feed. We need more and more food.
    One way to produce more food is growing stronger plants. For thousands of years, farmers have made plants better. Every season, they pick the best plants for the next season. It works very slowly. Since 1983, scientists have been able to change plants more quickly by changing their genetic（遗传的） material. Foods from plants grown in this way are called genetically modified(改变的) foods, or GM foods
    By changing the genetic material of a plant, it is possible to make new plants. They make plants which are strong against plant diseases. They can also help in our diseases; a kind of rice is being prepared , for example , which stops people becoming blind.
    Rich countries produce GM foods because they are easy to grow and bring in more money. Poor countries are interested in them because they help produce more food.
   GM plants are not natural. No one knows how good or bad they are,. Making GM foods is only one way of feeding people in 2050. There are strong feelings against them, because they are unnatural. They may feed people , then hurt them or their children later. But both rich and poor countries are interested in their use, and they are not going to go away. In 2050, we may think differently about them.

    Many of us don't pay attention to the importance of eye care. It's said that if you take care of your body, then you can be healthy. That is why our eyes should be given a lot of care. Natural eye care should be put in a number one place.
    There are several causes leading to poor eyesight like not enough food, gene(基因) and aging(年龄增长). Televisions, computers and reading are also the causes of having poor eyesight.
    If you happen to work in front of the computer, it is best to take a rest every once in a while. Something dirty can cause redness and they will make you feel uncomfortable. It is bad for your eyes, too. If this happens, the best way is to clean your eyes by using cold water. You must also try your best to protect your eyes from harmful thing. For example, sunglasses are not just fashion but they can also serve as a great way to protect your eyesight from UV rays.
    Eating healthy foods will do good to your eyesight. Remember that vitamins(维生素) A、C and E are good for eyes. Try to eat food groups that have these vitamins. And you should do eye exercises because exercise protects your eyesight, too. If a person exercises regularly(规律地) and eats the right kind of food, his eyes will stay in good condition for a long time.
    All above are natural ways of eye care that help us keep healthy eyes. Being happy all the time can be helpful to a person's eyesight, too. In a word, eye care is very important, no matter how old a person is.

根据短文内容，选择最佳答案。

Pollution

Hundreds of years ago, life was much harder than it is today. People didn't have modern machines. There was no modern medicine, either.

Life today has brought new problems. One of the biggest is pollution （污染）. Water pollution has made our rivers and lakes dirty. It kills our fish and polluted our drinking water. Noise pollution makes us talk louder and become angry more easily. Air pollution is the most serious kind of pollution. It's bad to all living things in the world.

Cars, planes and factories all pollute our air every day. Sometimes the polluted air is so thick that it is like a quilt over a city. This kind of quilt is called smog（烟雾）.

Many countries are making rules to fight pollution. Factories must now clean their water before it is thrown away, they mustn't blow dirty smoke into the air.

We need to do many other things. We can put waste things in the dustbin and not throw it on the ground. We can go to work by bus or with our friends in the same car. If there are fewer people driving, there will be less pollution.

Rules are not enough. Every person must help to fight pollution.

阅读短文，从A-E五个句子中选择正确选项还原到文中，使短文内容完整、正确。

Jane Goodall first made friends with a chimp (黑猩猩)when she was one year old. On her first birthday her mother carried her to the zoo near her home and bought her a toy chimp. {#blank#}1{#/blank#} At age 7, Jane Gooddatl read Dr. Doolittle, a book about a doctor who could talk to animals. She wanted to be able to talk to her favorite animal, too. She expected to go to Africa some day so that she could learn more about chimps. When Jane grew up, {#blank#}2{#/blank#}. She got her wish when she was 26 years old. She went to Gombe National Park where many chimps lived in the forests.

Jane watched the chimps closely day after day. {#blank#}3{#/blank#} They could think and make plans. They used tools. They showed their fear, pain, or pleasure. Sometimes, they fought. Often, they hugged(拥抱)and kissed. {#blank#}4{#/blank#}. They knew that the relation between chimps and humans was the closest. However, they did not know they acted so much like us.

Jane still has the toy chimp she was given as a child. She has studied her furry friends for over 30 years. Now, {#blank#}5{#/blank#}. She hopes that what she has to say will make others do something to protect chimps from being hurt.

A. She saw that they were a lot like people.

B. she still dreamed of going to Africa.

C. She loved her furry (毛绒) friend very much.

D. Scientists were surprised by what Jane saw.

E. she speaks for them to groups around the world.

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