All lights after the students left the classroom. A．went down B．goes off C．goes down D．went off 题目和参考答案——青夏教育精英家教网—

题目内容

All lights______after the students left the classroom.

A．went down

B．goes off

C．goes down

D．went off

【答案】

【解析】

试题分析：go down表示停止，被接受，沉下，被打败的意思，而go off表示离开，消失，变差，熄火的意思，所有的灯都熄灭，所以将go down和went down，排除，又根据时间状语after the students left the classroom.可知答案为一般过去时，故选D

考点：动词词组和动词的时态。

点评：本题考查的是动词词组的区别和识记

练习册系列答案

All lights______after the students left the classroom.

用括号内所给动词的适当形式填空
【小题1】She ___(write) twenty pop songs which are liked by fans by the end of last year.
【小题2】________(quarrel) with others isn’t good manners for everyone.
【小题3】－         the price           (include) coffee and hamburgers?
－I’m afraid not.
【小题4】The teacher told us that three quarters of our earth         (cover) by water.
【小题5】Everyone knows that the disabled mustn’t __________ (laugh) at
【小题6】We should try our best to prevent the air pollution                (live) a happy life.
【小题7】With all lights on, the hall______ (become) as bright as day when we arrived.
【小题8】How soon do you think we            (get) to the hotel?
【小题9】Mr. Green told me that his family        (go) for a holiday the next week.
【小题10】–Did you see him come in just now?

用括号内所给动词的适当形式填空

1.She _________ (write) twenty pop songs which are liked by fans by the end of last year.

2.________(quarrel) with others isn’t good manners for everyone.

3.－ the price (include) coffee and hamburgers?

－I’m afraid not.

4.The teacher told us that three quarters of our earth (cover) by water.

5.Everyone knows that the disabled mustn’t __________ (laugh) at

6.We should try our best to prevent the air pollution (live) a happy life.

7.With all lights on, the hall ________ (become) as bright as day when we arrived.

8.How soon do you think we (get) to the hotel?

9.Mr. Green told me that his family (go) for a holiday the next week.

10.–Did you see him come in just now?

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 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.

1. When the traffic lights turn ______, we will stop driving a car.

A. red B green C. yellow

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

A. longest b. weakest C. farthest

3. The underlined word "wavelength" means________ in Chinese.

A.波浪 B.光波 C.波长

4. 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

5.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

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