Don’t _________ any letter in the word, or it will be a wrong word.

   A. find out   B. give out  C. leave out  D. look out

The teacher stressed again that the students should not ________ any important details while retelling the story.

A. figure out             B. let out            C. leave out            D. pick out

Many children use the Internet to get useful knowledge and information, and to relax in their free time. But some of them are not using in a good way. Here are some rules to make sure you are safe and have fun on the Internet.

   ● Make rules for Internet use with your parents. For example, when you can go online, for how long and what activities you can go online.

   ● Don’t give your password (密码) to anyone else, and never leak out the following information---your real name, home address, age, school, phone number or other personal information. 

   ● Check with your parents before giving out a credit (信用) card number.

   ● Never send a photo of yourself to someone in e-mail unless your parents say it’s OK.

   ● Check with your parents before going into a chat room. Different chat rooms have different rules and attract different kinds of people. You and your parents must make sure it’s a right place for you.

   ● Never agree to meet someone you met on the Internet without your parent’s permission (允许). Never meet anyone you met on line alone.

● Always remember that people online may not be who they say they are. Treat everyone online as strangers.

● If something you see or read online makes you uncomfortable, leave the site. Tell a parent or teacher right away.

● Treat other people as you’d like to be treated. Never use bad language.

● Remember—not everything you read on the Internet is true.

1. If you want a true friend on the Internet , you can ____________ .

      A  tell the people what your name is .   B  meet the people on line alone.

      C  write an e-mail about yourself .     D  get your parent’s permission.

2.It’s good for children to ________ on the Internet.

A. give password to others         B. get useful knowledge and information

C. give out a credit card number   D. go into a chat room as they’d like to

3. The underlined phrase “leak out” in the third paragraph may mean “________.”

    A. give away      B. leave out         C. give out          D. put away

4.If your parents don’t agree, never ________.

A. read anything on the Internet        

B. relax in your free time

  C. have a face-to face meeting with anyone you met online

  D. treat other people as you’d like to be treated

5.This passage is mainly about “________”.

     A. How to use Computers              B. Surfing on the Internet

     C. Information on the Interne  D. Internet Safety Rules

    As bananas ripen， the green skin turns ye11ow gradually. Chemical changes occur in the f1esh of the fruit as well：starch（淀粉）changes to sugar；pectin（果胶）breaks down，losing its stiffness； and the f1esh softens.

Is ripening fruit a self－contained system， or is the rate of these changes affected by the environment？ We designed the experiment below to see if different atmospheres， produced by different packaging， affected the rate of ripening. You will vary the atmosphere surrounding unripe bananas and observe the effect on the ripening process。

Now set up the bananas in their environments as follows：

1. Put two green bananas in a paper bag and fo1d the top over to seal out the air.

2．Put one green banana and the very ripe banana in the other paper bag and fold over the top.

3. Put two green bananas in a plastic bag and seal it.

4. Wrap（包）one green banana tightly in a plastic bag.

5. Leave one green banana exposed to the air.

Leave the fruit a1one or five days to ripen. Ripening fruit“breathes”． This means that it takes up oxygen and gives off C02. Oxygen is extremely important and necessary for the chemical reactions involved in ripening. In addition, ripening fruit gives off another gas, called ethylene（乙烯）. Not only is ethylene a product of ripening fruit, it also promotes the further ripening of the fruit.

Paper bags tend to keep the ethylene in, but they allow oxygen and ethylene to pass through slowly. Plastic bags do not allow the free flow of oxygen or ethylene. In this experiment, the green banana in paper bag with the ripe banana should ripen most quickly. The green bananas in the paper bag should ripen faster than the bananas in the plastic bag. The banana left exposed to air has an unlimited supply of oxygen, so it will turn brown most quickly. You will notice that the side of this banana that rests on the counter will ripen more quickly than the other sides, because it has the

closest contact（接触）with its own ethylene. The banana that is tightly wrapped in plastic has no oxygen supply and should ripen most slowly. Now can you see why bananas are sealed in plastic in many supermarkets？

72. What makes the green banana in Bag 2 ripen more quickly than the ones in Bag 1？

A. Ethylene from the very ripe banana.            B. The free flow of oxygen or ethylene

C. C02 from the very ripe banana.                     D. The limitation of oxygen supply.

73. How can we slow down the ripening of bananas exposed to the air？

A. To rest them on the counter.                                   B. To keep them in the basket.

C. To put them on the ground.                                     D. To hang them up from the ceiling

74. It can be concluded from the passage that          .

A. the ripening banana is a self-contained system

B. the rate of ripening bananas is affected by the environment

C. wrapped bananas experience no chemical changes to ripen

D. ripening bananas give off oxygen, C0, and ethylene

75. Why are bananas sealed in plastic in many supermarkets？

A. To make them ripen more quickly.                B. To make them ripen more slowly.

C. To make banana flesh soften.                        D. To turn green bananas yellow.

It is often necessary to release a fish, that is , set it free after catching, because it is too small, or you just don’t want to take it home to eat. In some cases, releasing fish is a good measure that will help keep fish variety and build their population size. The Department of Game and Inland Fisheries (DGIF) encourages fishermen who practice catch-and-release fishing to use a few simple skills when doing so. The advice provided below will help make sure that the fish you release will survive  to bite again another day.

—When catching a fish, play it quickly and keep the fish in the water as much as possible.

Don’t’ use a net in landing the fish and release it quickly to prevent it from dying.

—Hold the fish gently. Do not put your fingers in its eyes. Don’t wipe the scales (鱼鳞) off the fish because it might cause it to develop a disease and reduce its chance of survival.

—Remove your hook (鱼钩) quickly. If the hook is too deep or hooked in the stomach, cut the line and leave the hook in. The hook left inside will cause no serious problem to the fish.

—Take good care of the fish by moving it gently in water . Release the fish when it begins to struggle and is able to swim.

—Do not hold fish in a bucket or some other containers and later decide to release it. If you are going to release a fish, do so right away.

With a little care and by following the suggestions given above, you can give the released fish a better chance of survival.

1.People sometimes set a fish free after catching it because they _________   

2.Which of the following will probably make a fish ill?

3. A proper way to release a fish is to _________.

4. What is the purpose of the text?