请在第__40__处填上正确答案。

请在第__40__处填上正确答案。A.negative B.criticize C.spiritually D.shameful E.affection F.d

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请在第__45__处填上正确答案。

请在第__45__处填上正确答案。

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请在第__39__处填上正确答案。

请在第__39__处填上正确答案。A.however B.shivering C.less D.fewer E.skinny F.exactly G.bodie

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Silk's strength comes from its weak hydrogen bonds working t

Silk's strength comes from its weak hydrogen bonds working together.A.Right B.Wr

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This species has nearly died out because its habitat is bei

This species has nearly died out because its habitat is being destroyed.A.turne

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