问题 单项选择题

中国的高速公路上有一种特有特色的建筑――收费站,从河北石家庄到北京一路上要碰到不下十几处收费站,这不仅给人一种随意设卡乱收费的印象,更为重要的是严重影响了车速,造成高速不速。因此( )。

A.撤掉收费站,高速路不收费

B.改革高速公路收费办法,保障公路畅通

C.大量修建高速路,以避免堵车

D.发展航空事业

答案

参考答案:B

阅读理解

If we are driving a car or crossing a street, we will stop when the traffic lights turn red. Why do we use red rather than other colors?

As we know, scattering (散射) happens when light goes through the air. For the same media, if the wavelength (波长) is long, the scattering will be short. If the wavelength is short, then the scattering will be long.

Of all light 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 see the lights. It helps drivers slow down or stop in time. 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 light helps drivers stop in time and help prevent accidents.

小题1:______ has the longest wavelength of all light we can see.

A.Red

B.Green

C.Yellow

D.Black小题2:Red light travels farther on ______ days.

A.windy

B.sunny

C.rainy

D.cloudy小题3:Red can make people act more quickly because ____________.

A.red can make people happier

B.the scattering of red is very short

C.the scattering of red is very long

D.red can make people more excited小题4:The underlined word “prevent” means ______ in Chinese.

A.逃避

B.防止

C.处理

D.检查小题5:The passage mainly tells us ____________.

A.why accidents happen

B.how the red light travels

C.why we use red traffic lights

D.how to stop in time at traffic lights

单项选择题