下图两个圆内切于A点,大圆直径48米,小圆直径30米,两个人同时从A点出发,以相同的速度在两圆上逆时针奔跑。问当小圆上的

下图两个圆内切于A点,大圆直径48米,小圆直径30米,两个人同时从A点出发,以相同的速度在两圆上逆时针奔跑。问当小圆上的人跑第几圈时,二人相距最远?

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--Which of these two books will you take?--I'll take _______

--Which of these two books will you take?--I'll take _________ , in case the jou

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With so many enthusiastic teachers __________us, we believe

With so many enthusiastic teachers __________us, we believe we'll __________to o

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Who is John?(  )

Who is John?(  )

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