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吸毒对人体的危害？

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All languages have some differences in verb forms which are used to produce cohesion.（南开大学2005研)

吸毒对家庭造成的危害？

吸毒对社会造成的危害？

What are the anaphoric expressions in the following utterance？ Dr. Dang gave Jane some medicine after she asked him for it.