根据短文回答题。Who Came First,the Chicken or the Egg?l just mailed

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Which of the following is a healthy eating habit?( )

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示范法由于范例的不同有( )。

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Who brought the Frenchmen's neckwear to Britain?( )

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下列关于排气筒监测采样时间与频次的说法正确的是(  )。

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