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