Carbon monoxide poisoning (一氧化碳中毒) causes death and injuries around the world. This gas is a problem in all parts of the world that experience cold weather. A few years ago, America’s Centers for Disease Control (C. D. C.) studied deaths linked (联系) with carbon monoxide poisoning. It found that the number of carbon monoxide deaths in the United States was greatest in January. The C.D.C. also found that carbon monoxide kills more than four hundred Americans each year. And, it said more than twenty thousand people are taken to hospital for treatment of health problems linked with the gas.
Carbon monoxide is called the silent killer because people do not know it is in the air. The gas has no color, no taste and no smell. It does not cause burning eyes. And it does not cause people to cough. Yet, carbon monoxide gas is very deadly (致命的). It steals the body’s ability to use oxygen.
Carbon monoxide makes it difficult for the blood to carry oxygen to body tissues (血管). It does this by linking with the blood. When the gas links with the blood, the blood is no longer able to carry oxygen to the tissues that need it. Damage (损害) to the body can begin very quickly from large amounts (数量) of carbon monoxide.
How quickly this can happen depend on how long a person is breathing the gas and how much gas he or she breathes in.
Carbon monoxide poisoning has warning signs(标志). But people have to be awake to realize them. Small amounts of the gas will cause a person’s head to hurt. He or she may begin to feel tired. Their stomachs may feel sick. The room may appear to be turning around. The person may have trouble thinking clearly.
People develop serious headache as the amount of the gas continues to enter their blood. They will begin to feel very tired and sleepy. They may have terrible stomachache.
Doctors say carbon monoxide influences people differently. For example a small child will experience health problems or die much sooner than an adult. The general health of the person or his or her age can also be important. The damage of carbon monoxide to the body has something to do with _____.
| A．the amount a person breathes in |
| B．whether a person is healthy |
| C．how many signs a person finds |
| D．ages of people |
One of the signs of carbon monoxide poisoning is _____.
| A．burning eyes | B．bad cough |
| C．serious headache | D．high fever |
Which of the following is TRUE according to the passage?
| A．Carbon monoxide poisoning seldom happens in cold areas. |
| B．Twenty thousand Americans are killed by carbon monoxide each year. |
| C．Most people know whether there is carbon monoxide in the air. |
| D．Carbon monoxide stops the blood from carrying oxygen to body tissues. |
What does the passage mainly talk about?
| A．Warning signs that carbon monoxide poisoning has. |
| B．Reasons why carbon monoxide can cause person’s death. |
| C．The damage of carbon monoxide and how it works. |
| D．Influences of carbon monoxide on children and adults. |
Recent research from the Pew Internet Project suggests that 90% of Americans aged from 12 to 17 use the Internet, and 51% of those teens use social networks. However, there are many possible problems with social networking sites and the teenagers who use them.
Apart from the social advantages, social networking sites can be used to record school research, develop artistic talents and experiment with other forms of subject creation. They provide a way to communicate with others who share the same interests and to get helpful advice on ongoing projects.
Along with these advantages come some dangers. For example, most social networking sites are open to all, especially MySpace, which is the most popular social network among teens in America. It means that they could be put in unpleasant and frightening situations.
A greater danger is that teens may become objects of the people with secret purposes. The secrecy of some social networking sites makes it easy for dangerous people to find young teens and invite them into dangerous conversations. It’s easy for them to pretend as teens and draw children into dangerous real-world communication as well. Then further hurt might be on its way.
Another danger is identity stealing, which can happen when teens share too much information about their names, dates of birth and locations.
Therefore, it’s very important to make sure teens are safe when they use social networks.
Many of the same rules that work for online chat work for these sites:
※ Don’t use your real name.
※ Don’t give out personal information to people you don’t know. A last name and a town are enough for a bad guy to find where you are.
※ Don’t believe that people are who they say to be.
※ Immediately end any communication that makes you uncomfortable and report it to a parent.
Only if you are sure of your safety, can you enjoy the fun brought by social networking. Besides, trying to deal with all problems on your own can lead to terrible results. Remember, asking your parents or school officials for help doesn’t mean you are unable to do anything but wiser than many others. How many dangers of using social networks are mentioned in the passage?
| A．2. | B．3. | C．4. | D．5. |
The writer takes MySpace as an example to show that ________.
| A．students could be put into unreal situations on the Internet |
| B．teenagers are facing unknown dangers on the social networks |
| C．Internet provides more social websites to American teenagers |
| D．social networks are very popular among teenagers in America |
We can infer from the passage that ________.
| A．the dangers are similar when chatting online and surfing social networks |
| B．more than half American teenagers aged from 12 to 17 use social networks |
| C．teens who ask for help are wiser when meeting problems on social networks |
| D．there are more disadvantages than advantages for teens to use social networks |
Cooking and Learning
In this E-book package, we have four e-books.
 Fun with Food This fun e-book is filled with exercises --- photo tests, word exams, riddle games coloring pages and exercises on learning more about food. |
 Kids Food Science Experiments Learn more about science and cooking with these food science experiments and instructions for kids. |
 Food Facts E-Book To go with the kids cooking lessons e-book, we’ve put our food facts into one e-book. Each part is easy to print off. You can keep it in the kitchen and teach kids facts about the food we eat. The Food Facts E-Book has over 60 pages. |
 Kids Cooking Lessons E-Book We’ve brought all our kids cooking lessons together into one easy e-book. We have a unit for each age group. This e-book is just planned to help you with cooking experience in the kitchen. If you’d like our lessons in e-book form with some learning exercises and other things, then this e-book is for you. |
Kids can ________ by reading Fun with Food.
| A．do science experiments |
| B．get cooking experience |
| C．cook well in the kitchen |
| D．play some riddle games |
________ has over sixty pages.
| A．Fun with Food |
| B．Kids Cooking Lessons E-Book |
| C．Food Facts E-Book |
| D．Kids Food Science Experiments |
Kids Cooking Lessons E-Book is popular because ________.
| A．there is a unit for each age group |
| B．there are a lot of photo tests in it |
| C．kids can learn more about science |
| D．each part is very easy to print off |
Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!
Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.
"We've learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."
British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.
But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It's hard to get a clear result.
Will there be a better indicator than litmus paper? The three kids decided to try and find out!
How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.
The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best color change. They decided it was the litmus paper!
"It's our first scientific journey, Huang said, "But it makes me want to try harder."Whom did the three kids want to challenge?
| A．Their chemistry teacher. |
| B．Their headmaster. |
| C．Robert Boyle |
| D．Thomas Edison |
From the text, a red cabbage is a kind of ____.
| A．plant | B．animal | C．paper | D．liquid |
What is widely used as the acid-base indicator now?
| A．red cabbage | B．litmus paper |
| C．any plant | D．any flower |
The story mainly tells us ____.
| A．how to make litmus paper |
| B．about the three kids' spirit |
| C．scientists were wrong |
| D．the kids are heroes |
We sometimes call the lion “the king of the jungle (丛林)” because it is stronger and more dangerous than other animals. It can run faster than many animals and it can hunt (捕猎) the best. It is the highest animal in the 1 food chain (食物链).
In the sea, the shark is one of the animals at the 2 of the food chain. It can swim faster than most other sea animals, and it can use its big teeth to eat them.
What is at the top of the world’s food chain? 3 are! We are not the biggest or fastest, but we are the 4 We could not run faster than cheetahs (猎豹), so we 5 cars and now we can move the fastest. We could not 6 better than lions, so we invented guns (枪). Now we can hunt the best.
People’s inventions are clever, but they can be dangerous, too. For example, people invented 7 , and now they make the air and rivers dirty. This can make 8 changes. Dirty rivers kill fish. Then bears cannot eat the fish and the bears die. If we kill one part of the food chain, 9 also die. Remember that we are a part of the food chain, so we are in danger too! If we protect animals, we are protecting 10 ! We should and we could do something for the world!
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One of the most popular items(项目) in the school newspaper is the advice column. No one knows who writes it. The students think their teacher does, but it might be a student using a false name.
The students enjoy thinking up problems for the advice column. Here are some of them and their answers.
Ask the Wise Owl
Q: I’m always late for school. I try not to be, but I can’t help it. Please advise me what to do. Tommy.
A: You are probably late for school because you don’t really like school. My advice to you is to try and enjoy school more, then you won’t be late so often.
Q: I find it difficult to make friends. What do you think I should do? Sara.
A: I can’t advise you until I know more about you. Your problem may be that you are shy. On the other hand, it may be the opposite. You may be too bold(冒失). Write and tell me more about yourself.
Q: I’m always at the bottom(底部，末尾) of the class. What do you advise me to do? Molly.
A: I advise you to concentrate on(全神贯注) improving your grades in one subject to start with. If you can do this, you should move a little way up from the bottom. Next, try to improve your grades in another subject, and so on. If you concentrate on one subject at a time, by the end of the year you should be quite a long way up from the bottom in all your classes.What is Tommy’s problem?
| A．He needs help with his homework. |
| B．He finds it difficult to make friends. |
| C．He is always late for school. |
| D．He is always at the bottom of his class. |
What does Molly want to do?
| A．To stay at the bottom of her classes. |
| B．To make more friends. |
| C．To concentrate on one subject at a time. |
| D．To improve her grades. |
What does the Wise Owl want Sara to do?
| A．Give more information about herself. |
| B．Stop being so shy. |
| C．Make more friends. |
| D．Stop being so bold. |
By the end of the year, where should Molly be in all her classes?
| A．At the top. |
| B．Quite a long way up from the bottom. |
| C．At the bottom. |
| D．A little way up from the bottom. |
What is the main idea of this passage?
| A．Sara finds it difficult to make friends. |
| B．Tommy wrote to the school newspaper to ask for advice. |
| C．The advice column in the school newspaper is very popular. |
| D．The school newspaper has an advice column. |