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請依下文回答第 34 題至第 38 題：There are many different types of emergency vehicles around the world. The types of emergency lights they usecan vary widely from country to country. In many areas, however, flashing red and blue lights are the standardemergency lights on many vehicles.There are a few theories about 34 red and blue lights become the most popular. For example, while the colorred is associated with stop and warning, red emergency lights can get 35 in heavy traffic because of the fact thatmost tail lights are also red. In these situations, blue lights really 36 and help to alert other drivers. Others pointto studies indicating that red lights may be more visible during the day, while blue lights may be more visible at night.Using a combination of flashing red and blue lights thus helps to alert drivers 37 the time of day. Finally, someexperts believe using both red and blue lights alleviates problems associated with drivers who are colorblind. Peoplewho have trouble seeing red often have no trouble seeing blue. 38 , drivers who can’t see blue can nonetheless seered. Using both red and blue lights thus helps to alert all drivers, even those with color blindness.
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(A) where
(B) when
(C) what
(D) why

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