Question

阅读下面的短文，根据短文内容，从短文后面的选项中选出恰当的选项补全短文，并将选项的编号依次填入题后横线上。

If we are driving a car，we will stop when the traffic lights turn red．1.  

As we know，scattering(散射) happens when light goes through the air．For the same media(媒质)，if the wavelength(波长) is long，the scattering will be weak．2.   

Of all light we can see red has the longest wavelength，so the scattering is the weakest．That means the red light travels far. 3.   

Using the red light can help drivers in farther areas see the traffic lights．4.   

If drivers don’t see the traffic lights until they are close，they may not be able to stop the car in time and an accident may happen．Red can also excite people．5. In a word，red lights can help drivers stop in time and help prevent (防止) accidents．

A．If the wavelength is short， then the scattering will be strong. B．We can act more quickly when we see the color red. C．Why do we use red instead of other colors? D．It helps drivers slow down or stop in time. E．In fact， it travels farther on rainy days.

Answer

1.C

2.A

3.E

4.D

5.B

【解析】

试题分析：本文主要是介绍了人们为什么使用红色作为交通信号灯。

1.C句意：为什么我们使用红色，而不是其他颜色？根据上句“we will stop when the traffic lights turn red．”当交通灯变红时，我们会停下来。结合语境可知，答案为C。

2.A句意：如果波长很短，那么散射会很强。根据上句“if the wavelength(波长) is long，the scattering will be weak．” 如果波长很长，散射将很弱。前后表达的意思是一致的，换一种说法，答案为A。

3.E句意：事实上，它在雨天传得更远。根据上句“That means the red light travels far.” 这意味着红色的光传的更远。此句进一步说明红光的传播效果，答案为E。

4.D句意：它可以帮助司机减慢或及时停车。根据上句Using the red light can help drivers in farther areas see the traffic lights．使用红灯可以帮助司机在更远的地方看到灯光。这对司机有很大的帮助，答案为D。

5.B句意：当我们看到红色的时候，我们可以更迅速地行动。根据上句“Red can also excite people．” 可知，红色也能让人兴奋。结合上下语境判断，答案为B。

考点：科普类短文阅读。