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Light travels________ than sound.

    A.much fast    B.far fast   C.much faster   D.more taster

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【小题1】____________(study) Zhalong helps us learn about protecting wildlife.
【小题2】Some of the students___________(remove)the snow when we arrived there.
【小题3】One of my classmates __________________ ( be) to the Great Wall twice.
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【小题5】Tom ____________ (live) in Nanjing for ten months in 2005.
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用动词的适当形式填空
【小题1】____________(study) Zhalong helps us learn about protecting wildlife.
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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(媒质), if the wavelength is long, the scattering will be short. If the wavelength is short, then the scattering will be long.

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A. longest    b. weakest       C. farthest

3. The underlined word "wavelength" means________ in Chinese.

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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.

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A. Why do accidents happen

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