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同类题1

电视台发射出一列波长为10m的无线电波,则它的频率大约是(   )

同类题2

关于光现象的下列说法中,错误的是(   )

同类题3

This is a big family c____ of ten people.

同类题4

关于光能的传递,下列说法正确的是  (  )

同类题5

    Now more and more people in the world are getting fatter. This troubles them a lot. (1)Experts(专家) say that it has a lot to do with our eating habits.
    Our eating habits are very important for good health and a strong body. Most of us like eating sweets and ice cream better than vegetables and rice. Sweets and ice cream are not bad for us if we eat them at the end of a meal. (2)If we eat them before a meal, they may take away our appetite(食欲).
    It's important for us to eat our meal in the same period each day. When we feel worried or excited, we may not want to eat. A long time ago, in England, some judges(法官) often decided whether a man was telling the truth by giving him some dry bread. If the man could not swallow(吞) the bread, it meant that he wasn't telling the truth. Because when a man is worried about something, he will have trouble in swallowing anything dry, because he loses his appetite.

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