We should be cautious in crossing a crowded street.

We should be cautious in crossing a crowded street.A.A careful B.B intelligent C

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根据以下听到资料,回答题。What are the students mainly discussing?

根据以下听到资料,回答题。What are the students mainly discussing?

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生产成本包括直接材料、直接人工和期间费用。 (  )

生产成本包括直接材料、直接人工和期间费用。 (  )

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