某科研团队有一、二两个研究小组共计 16 人，根据科研需要，现将年龄最小的 2 人调入二组。结果二组的平均年龄增加了 1 岁，一组的平均年龄增加了 2 岁。已知一组共有 6 人，则原来两组平均年龄的差值是（）岁。<br/>

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The income divide remains ( ) although African Americans have increased the leve

A more widely B wide C widely D wider

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India has downplayed the impact of US, plans to end New Delhi's preferential tra

A worthing B worth C worth of D worthy of

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Four Big Tech CEOs spent Wednesday being grilled—virtually—by House lawmakers, c

A view B lesson C spectacle D exhibition

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Even as millions of Americans have lost their jobs in the past few weeks, nonpro

A giving up B giving back C giving away D giving out

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Caregiver stress is a well-known phenomenon and good one to avoid. It can lead t

A danger B adventure C emptiness D burnout

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The U.S. is slowly ( ) the sharpest economic contraction in modern history, as p

A forcing upon B squeezing into C dragging out D looking out for

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The federal government has issued guidelines to give a 50% ( ) in a fixed time-f

A benefit B bonus C allowance D subsidy

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Students with attention ( ) or communication difficulties may not be able to foc

A disparity B difference C debt D deficit

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Researchers at Pennsylvania State University are intent on creating a robotic sy

A artificially B completely C manually D synthetically

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The decline in Germany's output last quarter, if calculated on an annual basis w

A count in B amount to C go up D aim at

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某科研团队有一、二两个研究小组共计 16 人，根据科研需要，现将年龄最小的 2 人调入二组。结果二组的平均年龄增加了 1 岁，一组的平均年龄增加了 2 岁。已知一组共有 6 人，则原来两组平均年龄的差值是（）岁。