Many people can use computers, but few of them know how to use them properly(合理地). Here are five suggestions for you when you use your computer.

1. Keep your computer in a cool, dry room. Computer work best at a temperature of 5ºC ~30ºC.

2. Do not smoke or let other people smoke cigarettes near your computer. Smoke of all kinds can cause many problems.

3. Do not eat or drink when you are near your computer. Pieces of food and some water in the keyboard can also cause many problems.

4. Make sure that keyboard and the screen(屏幕) are at the proper height for you. If not, you will get a backache.

5. Make sure the screen is at the suitable distance from your eyes. Keep your screen clean and do not have it too bright. A dirty screen can hurt your eyes. A very bright screen can also be bad for your eyes.

(     )46. What will happen to the computer when room temperature is below 0ºC?

A. It may become dirty.                B. It may break into pieces.

C. It may not work as well as usual.      D. It will be bad for your eyes.

(     ) 47. Your had better not eat or drink at the computer because _____________.

A. the food may cause problems         B. the food may taste bad

C. the screen will harm (伤害) you       D. the screen will be dark

(     ) 48. Which suggestion is about how to protect your eyes when you use a computer?

A. No.2.         B. No. 3             C. No.4         D. No.5 

(     ) 49. The title of this passage is most probably ______________.

A. How to use computers        B. How to cool computers

C. How to buy computers        D. How to clean computers

(     ) 50. The passage can most probably be found in a ____________book.

A. history     B. science     C. travel    D. math

Learning about the environment is very important. There are many good books that will help you learn. To get started, ask your teacher or your friends for some advice. You can also look at some good websites with information about the environment and climate change. Climate change may be a big problem, but there are many little things we can do to make a difference.

Driving a car or using electricity is not wrong. We just have to be smart about it. Some people use less energy by sharing a car. For example, four people can ride together in one car instead of driving four cars to work. Whenever we use electricity, we put greenhouse gases into the air. By turning off the lights, the television, and the computer when they aren’t needed, you can help a lot.

Don’t buy products (产品) that use too much energy. Some products, like certain cars, are made specially to save energy. These cars can travel longer on less gasoline (汽油). They don’t pollute as much, either. Products like computers, TVs and VCRs with the ENERGY STAR label (标签) are made to save energy. Buying products with these labels will help protect the environment.

??? Buy recyclable (可循环再用的) products instead of non-recyclable ones. Recyclable products are usually made out of things that have already been used. It usually takes less energy to make recyclable products than to make new ones. So when you go shopping, look for the recycle mark on the package. The less energy we use, the better.

1.The passage is mainly about ________________.

A. some suggestions about cars

B. an advertisement

C. the changes to the climate

D. the ways to protect the environment

2.From the passage, we can learn that ________________.

A. turning off the electricity when it isn’t needed can do good to the environment

B. electricity won’t cause great trouble to our environment

C. cars using less energy will not put greenhouse gases into the air

D. recyclable products are marked with the ENERGY STAR label

Learning about the environment is very important. There are many good books that will help you learn. To get started, ask your teacher or your friends for some advice. You can also look at some good websites with information about the environment and climate change. Climate change may be a big problem, but there are many little things we can do to make a difference.

Driving a car or using electricity is not wrong. We just have to be smart about it. Some people use less energy by sharing a car. For example, four people can ride together in one car instead of driving four cars to work. Whenever we use electricity, we put greenhouse gases into the air. By turning off the lights, the television, and the computer when they aren’t needed, you can help a lot.

Don’t buy products (产品) that use too much energy. Some products, like certain cars, are made specially to save energy. These cars can travel longer on less gasoline (汽油). They don’t pollute as much, either. Products like computers, TVs and VCRs with the ENERGY STAR label (标签) are made to save energy. Buying products with these labels will help protect the environment.

    Buy recyclable (可循环再用的) products instead of non-recyclable ones. Recyclable products are usually made out of things that have already been used. It usually takes less energy to make recyclable products than to make new ones. So when you go shopping, look for the recycle mark on the package. The less energy we use, the better.

1.The passage is mainly about ________________.

A. some suggestions about cars

B. an advertisement

C. the changes to the climate

D. the ways to protect the environment

2.From the passage, we can learn that ________________.

A. turning off the electricity when it isn’t needed can do good to the environment

B. electricity won’t cause great trouble to our environment

C. cars using less energy will not put greenhouse gases into the air

D. recyclable products are marked with the ENERGY STAR label

Learning about the environment is very important. There are many good books that will help you learn. To get started, ask your teacher or your friends for some advice. You can also look at some good websites with information about the environment and climate change. Climate change may be a big problem, but there are many little things we can do to make a difference.

Driving a car or using electricity is not wrong. We just have to be smart about it. Some people use less energy by sharing a car. For example, four people can ride together in one car instead of driving four cars to work. Whenever we use electricity, we put greenhouse gases into the air. By turning off the lights, the television, and the computer when they aren’t needed, you can help a lot.

Don’t buy products (产品) that use too much energy. Some products, like certain cars, are made specially to save energy. These cars can travel longer on less gasoline (汽油). They don’t pollute as much, either. Products like computers, TVs and VCRs with the ENERGY STAR label (标签) are made to save energy. Buying products with these labels will help protect the environment.

    Buy recyclable (可循环再用的) products instead of non-recyclable ones. Recyclable products are usually made out of things that have already been used. It usually takes less energy to make recyclable products than to make new ones. So when you go shopping, look for the recycle mark on the package. The less energy we use, the better.

1.The passage is mainly about ________________.

A. some suggestions about cars                                    

B. an advertisement

C. the changes to the climate                                

D. the ways to protect the environment

2. From the passage, we can learn that ________________.

A. turning off the electricity when it isn’t needed can do good to the environment

B. electricity won’t cause great trouble to our environment

C. cars using less energy will not put greenhouse gases into the air

D. recyclable products are marked with the ENERGY STAR label