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【简答题】
Before we can treat new diseases, we have to understand how they are spread. ( ) new diseases, we have to understand how they are spread.
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【单选题】He keeps them in _____.
A.
plastic bags inside plastic boxes
B.
their original packages
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【单选题】He keeps them in _____.
A.
plastic bags inside plastic boxes
B.
their original packages
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