Miss Evans【C1】______physics in a London school. Last month she was explaining to one of her【C2】______about sound, and she decide

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问题     Miss Evans【C1】______physics in a London school. Last month she was explaining to one of her【C2】______about sound, and she decided to test them to see how successful she had been【C3】______. She said to them, "Now, I have a sister in Washington. If I was calling her【C4】______, and at the same time you were 20 meters away, and listened to me from【C5】______of the street, who would【C6】______what I said earlier, my sister or you and【C7】______?" A clever boy at once answered, "Your sister, Miss Evens. It is because electricity travels faster than【C8】______. "
    "That’s very good. " Miss Evans answered: but then one of the girls put up her hand, and Miss Evans said, "Yes, Betty?" "I disagree, " Betty, said. "Your sister would hear you earlier【C9】______when it’s eleven o’clock here, it’s【C10】______six o’clock in Washington. "
【C2】

选项 A、students
B、pupils
C、classes
D、friends

答案C

解析 根据后文的tortest them.可推知one of的后面只能填一集合名词(classes)。如填别的选项,one of…就必为单数,与them相矛盾。
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