答案　A　[主旨大意题。由文章的意思可知文章主要讲的就是维生素D的摄取对人体的益处以及对人体的危害。故A项是最好的题目。]

　　B

　　educational film Shop ‘Til You Drop：The Crisis of Consumerismr planet, with its limited resources to support that appetite.To set the stage, we hear a recitation by Juliet Shor, author of Born to Buy梐ll the objects in a typical middle class home.,

　　The first half of the film focuses on the psychological effects of consumerism: how the media and advertisers direct us and how their techniques control our desires, making us believe that we need much more than we actually do.

　　If you play soft music to cows, they give more milk.If you play music to shoppers, they buy more stuff.The many talking heads in the film—professors, authors, mental health professionals, and leaders of the Voluntary Simplicity movement梥uggest that we need to step out of it and learn to make choices for ourselves.e

　　Once upon a time, we consumed noticeably (明显地) because we wanted our neighbors to see what we had; the paradigm was local social comparison.Today, levised affluence (富裕)．There's rising anxiety in our culture as people continuously compete to live like the wealthy.

　　of developed nations is using up or harming—even destroying—our most precious resources.In the process, we may well be sowing the seeds of our own destruction.

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