What would be the best title for the passage?

What would be the best title for the passage?A.First device powered by walking w

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After the boat's motor failed, they were__________ of the we

After the boat's motor failed, they were__________ of the weather.A.at the cost

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Some people worry that the application of new technology may

Some people worry that the application of new technology may be a risk to the __

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甜的;糖果a.n.s _ _ _ _

甜的;糖果a.n.s _ _ _ _

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几何平均数的主要用途是(  )。

几何平均数的主要用途是(  )。A.确定组距 B.计算众数 C.确定组限 D.对比率、指数等进行平均 E.计算平均发展速度

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