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 is long, the sscattering 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 places see the lights. It helps drivers slow down or stop in time. So there will be fewer accidents. Moreover, 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.

1.According to the passage, the scattering of the red light is the _______.

A. longest B. weakest C. farthest D. brightest

2.The underlined word “wavelength” means________ in Chinese.

A. 光波 B. 波浪 C. 波长 D.光波

3.What can the red light help drivers do?

A. It can make drivers stop in time.

B. It can help drivers act more slowly.

C. It can help drivers see the lights in farther areas .

D. A and C

4.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

D. The colors of the traffic lights

On my eighth birthday, Dad bought me an accordion(手风琴） and said excitedly, "Once you learn to play, it'll stay with you for life." But I didn't want to play it. I just wanted to play games, But Dad asked me to take accordion lessons.

One day, I found a box in a corner. When I opened it, I saw a beautiful violin. "It was your father's," Mum said. "His parents bought it for him. I guess he got too busy on the farm to learn to play it."

I had to practice half an hour every day, and every day I tried to get out of it. But Dad didn't allow. I asked why. He answered, "Because you can bring people joy. You can touch their hearts." He added softly, "Someday you'll have the chance I never had: you'll play beautiful music for your family. And you'll understand why you've worked so hard." I was speechless.

The lessons stopped after I finished high school. When I grew up, I got married and moved into a new house. I put the accordion in the attic（阁楼）.

One afternoon, my two children found the accordion by accident (偶然). They got very excited. "Play it. Play it," they laughed and said. I started to play some simple songs. I was surprised I could still remember them. Soon the kids were dancing. Even my wife was laughing and clapping to the beat.

At that moment, my father's words came back to me, "Someday you'll have the chance I never had. And you'll understand." I finally knew why Dad had asked me to practice hard. Dad never learnt to play his violin. But I told my family, "This is my father's music."

1.My father didn't learn to play his violin when he was young because _____.

A. he didn't like to play the violin

B. he didn't keep on practicing

C. he wanted to play games

D. he had to make money for his family

2. How might the writer feel when he had to practice playing the accordion?

A. Bored B. Excited.

C. Delighted D. Relaxed.

3."Dad didn't allow" means "_______".

A. Dad didn’t keep me doing it.

B. Dad didn't agree with me.

C. Dad didn't help me do it.

D. Dad didn't see me do it.

4. Dad asked me to learn to play the accordion so that _______.

A. I could go to a better school

B. I could give myself much joy

C.I could make people happy

D. I could be a useful

You may know the English letters A, B and C. But do you know there are people called ABC? You may like eating bananas. But do you know there is such a thing a “banana person”? How strange! Are these people from “another earth”? No, they are just Chinese people like you and me.

ABC means American-born Chinese. An ABC is a Chinese, but was born in the United States. Sometimes, people call an ABC a “banana person”. A banana is yellow outside and white inside. So, when a person is a banana, he or she is white inside-thinking like a Westerner and yellow outside-looking like a Chinese.

Do you know why? Usually, ABCs know little about China or the Chinese language. Some of them don’t speak Chinese. Also, they are not interested in Chinese politics.

But if ABCs can not speak Chinese, can we still call them Chinese people? Yes, of course. They are Chinese. They are overseas Chinese (华侨). These people may be citizens (公民) of another country like the US, Canada or Singapore. But they have Chinese blood. Their parents, grandparents or even great-grandparents were from China. They all have black eyes and black hair. But they are not Chinese citizens. They are not people of the People’s Republic of China. For example, we all know the famous scientist, C.N.Yang(杨振宁). He got the Nobel Prize for Physics in 1957. Chinese people love him. But he is an American citizen.

1.What does “ABC” mean in this passage ?

A. three English letters

B. a kind of banana

C. Chinese born in America

D. Americans born in China

2.Why are Chinese in Western countries called “banana persons”?

A. their bodies are white inside but yellow outside

B. they like to eat bananas

C. they were born in China but got to study in America

D. they think like Westerners but look like Chinese

3.What does the underlined word “blood” probably mean?

A. 国籍 B. 血统 C. 爱心 D. 皮肤

4.What does this passage mainly talk about?

A. different kinds of bananas

B. the life story of C.N.Yang

C. the differences between Chinese and foreigners

D. overseas Chinese

Tom likes playing ___ football， but his sister likes playing __ piano.

A. the； / B. /； the C. /； / D. the； the

My brother is a good . He can delicious food.

A. cooker， cook B. cook， cook

C. cook， cooks D. cooker， cooks

My parents often ask me ________my bedroom by myself.

A. cleans B. to clean C. cleaning D. clean

--- Where ____ your uncle _____?

--- He’s from China.

A. is； come from B. does； from

C. is； from D. is； comes from

Jack can’t sing English songs， he can’t dance， _____.

A. either B. also C. too D. as well

He has a great time ________soccer at school.

A. play B. playing C. to play D. played