When the traffic lights turn red, we will stop driving a car or crossing a street. Why is red used for traffic lights instead of other colors?
As we know, scattering(散射) happens when light goes through the air. For the same media(媒质), if the wavelength islong, the scattering will be short. If the wavelength is short, then the scattering will be long.
Of all lights we can see red has the longest wavelength, so the scattering is the weakest. That means the red light travels far. In fact, it travels farther on rainy days.
Using the red light can help drivers in farther areas sec the lights. It helps drivers stow down or stop in lime. If drivers don't see the red light until they are close, they may not be able to stop the car in time. An accident may happen Red can also excite people. We can act more quickly when we see the color red. In a word, red lights help drivers stop in time and help prevent accidents. When the traffic lights turn ______, we will stop driving a car.
A. red B green C. yellowAccording to the passage, the scattering of the red light is the _______.
A. longest b. weakest C. farthest The underlined word "wavelength" means________ in Chinese.
A.波浪 B.光波 C.波长 What can the red light help drivers do?
A. It can help drivers in farther areas see the lights.
b. It can help drivers slow down or stop in time.
C.A and b Which of the following is the best title?
A. Why do accidents happen
b. How does the red light travel
C. Why do we use red traffic lights
Generally speaking, American food is not very thick in taste. Salads are much liked and are served all year round. Many Americans are trying to keep down their weight. This is shown in menus offering “low calorie（卡路里）” or “weight watchers” meals. In markets, one can find “No Cal” drinks (meaning without calories) such as cola.
Many Americans drink coffee or tea with their meal. If a waiter in an American restaurant asks “Now or later?”, what he means is “Do you want coffee with your meal or later?” When eating out in the USA, we can ask for tea, milk, beer, and so on, if we prefer these to coffee. American restaurants cannot serve beer, wine, or liquor unless they are licensed to do so.
The main dish in American meals is usually meat, chicken or fish, but more than one of these is hardly served at the same meal.
Most Americans eat quickly during the day—that is, breakfast and lunch—unless it is a social, business, or family situation. The evening meal, however, is usually a family time. Racing through daytime meals is part of the “American pace” of life, for working hours are considered important.
The nationwide fast-food restaurants are suitable for the ways of American eating. The standard(标准的) products, of nearly the same price, are served quickly, and taste the same whether bought in New York City or in Los Angeles.
McDonald’s is a popular restaurant. It offers many choices of hamburgers, French fries and “cokes”. These foods are rich in fats, sugar and salt. Often, they are the major meal of the day of many young working people.“Weight watchers” most probably means in Chinese.
| A．减肥者 | B．观察者 |
| C．称重者 | D．参与者 |
. In American restaurants which of the following is NOT true？
| A．Many American people like salads. |
| B．Coffee can be served after a meal. |
| C．One can order tea if he doesn’t like coffee. |
| D．All restaurants can sell beer and wine. |
At the same meal, American people usually .
| A．have meat, chicken and fish together |
| B．have either meat or chicken or fish |
| C．drink a lot of beer, wine or liquor |
| D．sit down together around a table |
In American restaurants, the standard foods .
| A．have different prices | B．taste different from place to place |
| C．are very expensive | D．can be served quickly |
This passage mainly talks about .
| A．American restaurants and people | B．American eating culture |
| C．American working situation | D．American food and price |
Mike was the kind of guy you love to hate. He was always happy and always had something interesting to say. If someone asked him how he was doing, he would reply, “Couldn’t be better!” He was really a care-free young man and never felt tired.
Mike used to say, “Each morning I wake up and say to myself, ‘Mike, you have two choices(选择) today. You can choose to be happy or you can choose to be upset.’ I choose to be happy. Each time something happens, I am always ready to learn a good lesson. I choose to learn from life.”
I tried to understand what he said. Indeed life is all about choices. Every situation is a choice. The bottom line is: You’re living your life and you make it either happy or sad.
Several years later I had a car accident and my legs were seriously injured. When I was lying on the ground, I remembered that I had two choices: I could choose to live or choose to die. I chose to live.
People like to say, “Choose the one you love and love the one you choose.” Why not choose the one we love and live happily? What kind of man was Mike?
| A．A happy young man. | B．A hard-working man. |
| C．An ugly bad boy. | D．A kind young man. |
What does “Couldn’t be better!” mean?
| A．It’s bad. | B．It’s very good. |
| C．It isn’t bad. | D．It isn’t very good. |
Which of the following is NOT true?
| A．Mike tried to be happy every day. |
| B．Mike chose to learn from life. |
| C．The writer learned from Mike. |
| D．The writer was unhappy every day. |
When the writer got hurt in a car accident, .
| A．he loved the one people chose | B．people loved the one he chose |
| C．he chose to live | D．he chose to die |
Which can be the best title for the passage?
| A．Life Is Difficult | B．Life Is Different |
| C．Life Is Colorful | D．Life Is Full of Choices |
Like most English children, I learned foreign languages at school. When I made my first visit to the United States, I was sure I could have a nice and easy holiday without any language problem. But how wrong I was!
At the American airport, I was looking for a public telephone to tell my friend Danny that I had arrived. An American asked if he could help me. “Yes,” I said, “I want to give my friend a ring.”
“Well, that’s nice. Are you getting married?” he asked.
“No,” I replied, “I just want to tell him I have arrived.”
“Oh,” he said, “there is a phone downstairs on the first floor.”
“But we’re on the first floor now,” I said.
“Well, I don’t know what you are talking about. Maybe you aren’t feeling too well after your journey,” he said. “Just go and wash up, and you will feel a lot better.” And he went off, leaving me wondering where on earth I was: At home we wash up after a meal to get the cups and plates clean. How can I wash up at an airport?
At last we did meet. Danny explained the misunderstanding: Americans say “to give someone a call”, but we English say “to give somebody a ring”. When we say “to wash your hands”, they say “to wash up”. And Englishmen start numbering from the ground floor so the first floor is the second for Americans.The writer went to America by __________.
| A．plane | B．ship | C．bus | D．train |
The writer went to America for __________.
| A．education | B．business |
| C．holiday | D．friendship |
The American thought “a ring” should be a __________.
| A．phone call | B．present |
| C．person | D．letter |
Englishmen usually wash up __________.
| A．after dinner | B．after a journey |
| C．when they are tired | D．before they telephone someone |
The third floor in England is the __________ floor in America.
| A．first | B．second | C．third | D．fourth |
Many people hurt their backs when they try to lift heavy things from the floor. It is easy to hurt your back muscle(肌肉) when you try to pick up a heavy thing. However, there is a correct way to lift things from the floor. If you pick up heavy things correctly, you probably will not hurt your back.
To lift something from the floor correctly, first bend (弯曲) your knees and lower yourself. Keep your back straight. Do not bent over, from your waist (腰) keep your back and hips (臀部) and waist in a line. If you bent over, the muscles in your lower back can became hurt very easily. If you keep your back and hips straight, the muscles are stronger, because they hold up together. The other muscles can then help the lower back muscles.
As you lower yourself, try to get as close to thing as you can, put one knee on each side of the thing. Remember at all times to keep your back straight. Put your hand under the thing that is in front of you, between y our knees.
To lift the thing, you should stand up slowly. Use your leg muscles in order to stand up. In other words, lift with your legs, not with your back.Which part of your body is more easily to be hurt when you lift heavy things?
| A．The leg muscles. | B．The back muscles |
| C．The hips | D．The knees |
Many people hurt their backs when they lift something because _______.
| A．they are not strong |
| B．the things are very heavy |
| C．the way to lift the things is not correct. |
| D．they are very heavy |
The muscles are stronger if you _______.
| A．keep your back, hips and waist in a line |
| B．bend over from your waist |
| C．lower your self |
| D．get down on your knees |
To lift heavy things, the most important of all is to _________.
| A．stand up slowly | B．keep your back straight |
| C．bend your knees | D．put one knee on each side |
What does “In other words” mean? ________
| A．总而言之 | B．换句话说 |
| C．在其它话中 | D．在其它单词中 |
Many places in the world need more fresh water(淡水). 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 isn't hot enough, or it doesn't shine every day. In these places other ways to heating(加热) sea water can be used. These ways cost more money, but they work faster than the sun. By boiling(煮沸) 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(冷冻). The fresh part of salt water freezes first. To get fresh water, the pieces of ice are taken out.
Which way is 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 doesn't make very much water at a time. But the factory is easy to build and cost little.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 |
The Symi factory .
| A．is a fresh water factory |
| B．can be built everywhere |
| C．can make much fresh water at a time |
| D．doesn't need sunshine every day |
Which is the best way for small and hot places to get fresh water?
| A．Boiling or heating the sea water. |
| B．The way in sunny places. |
| C．The Symi's way. |
| D．Freezing the sea water in cold places. |
The writer is mainly talking about .
| A．water making factories in different countries |
| B．the ways of making fresh water from sea water |
| C．hot places and dry places |
| D．how to make good use of the sunlight |
Which of the following isn't true?
| A．New ways are tried to get fresh water. |
| B．A lot of fresh water can be made quickly by heating. |
| C．The best way is to get the most fresh water with the least money. |
| D．The Symi's way doesn't work in dry places. |