[交际用语]- Hey, Linda. You look so pale. What's the matter? - _________

[交际用语]- Hey, Linda. You look so pale. What's the matter? - _________

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[交际用语]- How are you going on with your English?- _________A I am very well. B

[交际用语]- How are you going on with your English?- _________A I am very well. B

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以下属于密度梯度离心法的有()。A.差速离心法B.沉降速率法C.速率区带离心法D.等密度区带离心法E.分析离心法

以下属于密度梯度离心法的有()。A.差速离心法B.沉降速率法C.速率区带离心法D.等密度区带离心法E.分析离心法

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[交际用语]- How many languages does Peter speak? - _________A Many languages. B Pr

[交际用语]- How many languages does Peter speak? - _________A Many languages. B Pr

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[交际用语]- Is that seat taken? - _________

[交际用语]- Is that seat taken? - _________

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