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Experts believe_______people can waste less food by shopping only when it is necessary.
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Tom is in Class Six.Mary is in ClassSix,too.( 改为同义句)
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The teacher can _____ the reason (原因)to you.
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被联合国确定为工作语言的有_______、_______、_______、_______、_______、_______这六种
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已知直线l和平面α斜交,则平面α内到的距离等于定值d的点的轨迹是什么?
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