It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere

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• 已知三个实数x1，x2，x3，它们中任何一个数加其余两个数的积的5倍总等于6，这样的三元数组（x1，x2，x3），共有（）A．2组B．3组C．4组D．5组-数学
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• ________ the football match will be played depends on the weather.A．IfB．WhetherC．ThatD．Where-高三英语
• It makes little difference to me ________we go or stay.A．whetherB．whereC．thatD．how-高三英语
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• (2011·重庆)It is still under discussion ________ the old bus station should be replaced with a modern
• k取什么值时，方程组有一个实数解？并求出这时方程组的解。-九年级数学
• —What do you think was the highlight of your school life?—_______.A．When I had won championship in t
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• 不定方程2（x+y）=xy+7的所有整数解为______．-数学
• 设x、y都是正整数，则方程x2-y2=2001的解的个数是______．-数学
• 方程组的解是（）。-九年级数学
• ________ caused the accident is still a complete mystery.A．WhatB．That C．HowD．Where-高三英语
• It suddenly occurred to him________he had left his keys in the office. (2012·江西，25)A．whetherB．whereC
• The limits of a person's intelligence，generally speaking，are fixed at birth，but ________ he re
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• 高一某班在入学体检中，测得全班同学平均体重是48千克，其中男同学平均体重比女同学平均体重多20％，而女同学人数比男同学人数多20％，求男、女同学的平均体重各是多少？-九年级数学
• It doesn't matter ________ you pay by cash or credit card in this store.(2012·山东 )A．howB．whethe
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• The limits of a person’s intelligence，generally speaking，are fixed at birth，but________he reaches th
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• 解方程组：-九年级数学
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• It doesn’t matter ________ you pay by cash or credit card in this store.(2012·山东，25)A．howB．whetherC．
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• 若x，y为正整数，且x2+y2+4y-96=0，则xy=______或______．-数学
• 解方程组：。-九年级数学
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• the new underground is available has not been made clear yet.A．WhenB．HowC．WhatD．That-高三英语
• Before a problem can be solved, it must be obvious ______the problem itself is. A．whatB．thatC．whichD