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閱讀短文，從每題所給的ABC三個選項中選出最佳答案回答問題或完成句子。
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(媒質), 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.
小題1:When the traffic lights turn ______, we will stop driving a car.
A. red    B green     C. yellow
小題2:According to the passage, the scattering of the red light is the _______.
A. longest    b. weakest       C. farthest
小題3:The underlined word "wavelength" means________ in Chinese.
A.波浪        B.光波      C.波長
小題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
小題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

小題1:A
小題2:B
小題3:C
小題4:C
小題5:C

試題分析：這篇短文主要介紹了在交通燈變成紅燈時我們就會停止停止開車和過馬路，為什么交通燈會設計成紅色而不是其他的顏色呢？文章給我們進行了解釋。
小題1:細節理解題。根據第一段的第一句：When the traffic lights turn red. we will stop driving a car or crossing a street.可知。故選A
小題2:細節理解題。根據第三段的第一句：Of all lights we can see red has the longest wavelength, so the scattering is the weakest.可知。故選B。
小題3:詞意猜測題。根據句意為：如果波長長，那么散射短。故選C
小題4:細節理解題。根據最后一段的第一句：Using the red light can help drivers in farther areas see the lights, it helps drivers stow down or stop in time. 可知，故選C
小題5:歸納理解題。根據由本文的第一段提出問題：Why is red used for traffic lights instead of other colors? 可知，故選C

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