解析：选A。句意理解题。根据前文可知，有大量的证据表明在不同的社会中男女所扮演的角色也各不相同。该句暗示性别角色也是由社会因素决定的，应选择A。

　　B

　　They can be damp and cold.But with a growing number of men seeing the shed as a home from home，research claims the solitude (独处)it provides at the bottom of the garden could actually be good for their health.

　　A study published in the British Medical Journal suggests that the peaceful retreat (退隐)may help lower blood pressure.Its author，Professor Alan White of Leeds Metropolitan University，claims the hours spent pottering (闲逛) about in sheds doing odd jobs also have a positive effect on men's self－esteem. “Men find doing things relaxing and that in itself is good for their health，” he said.“There's a sense of achievement that men get from starting a task to seeing it completed.Men know what a shed means and they feel comfortable.”

　　Such has been the growth in its popularity that communal (共享的) sheds are being set up to enable men to share their love of pottering and DIY. The “Men's Sheds” initiative has its roots in Australia. But 20 communal sheds have already sprung up in the UK from the Lake District to Greenwich. Peter Baker, chief executive of the Men's Health Forum，a charity involved in the scheme，said，“They've caught men's imagination.Men like to potter.”

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