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第1题

The mass of an object is multiplied by the speed of light squared, _____ other words , the speed of light is multiplied
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第2题

The custom of visiting friends, relatives and neighbors on New Year’s Day is one the Old World traditions that has _____
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第3题

Professor Mackay told us that ______ of lead are its softness and its resistance. Asome property Bsome properties C
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第4题

______ anywhere in the United States costs less than a dollar when you dial it yourself . AThree-minute call BA thre
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