Bees Prefer Flowers That Proffer Nicotine_SSS-20170517-Conversation 1__托福听力考满分

题目内容

纠错

听力音频

听力原文

This is Scientific American 60-Second Science. I'm Christopher Intagliata.We humans enjoy coffee and tea, to give our brains a caffeine boost.And bees sometimes sip nectar that naturally contains caffeine, which seems to enhance their memory.Now a study suggests that bees enjoy another familiar drug produced by plants: nicotine."As it turns out, not just in humans, but even the bees seem to have difficulties quitting."Lars Chittka, a professor of behavioral and sensory ecology at Queen Mary University of London.Chittka and his colleagues studied bumblebees as they visited fake flowers that contained varying levels of nicotine.Unnaturally high nicotine concentrations deterred the bees.But at real-world levels, the drug attracted bees.And they even learned a flower's color faster, if that flower offered a nicotine fix.Sometimes bees paid a steep price for this preference."They returned actually to flowers that had previously sold them nicotine, so to speak, even if these flowers no longer contained nectar. Which might give nicotine-pushing plants, like tobacco, an edge."It provides these plant species with an unfair advantage over competing plants, because they can retain the faithful services of pollinators, even if they're offering suboptimal nectar in this case."The results are in the journal Scientific Reports.And if caffeine and nicotine have these effects on bees?Perhaps natural floral pharmacies stock other drugs too-that enhance pollination, and give bees a buzz.Thanks for listening, for Scientific American 60-Second Science. I'm Christopher Intagliata.

题目讨论

如果对题目有疑问,欢迎来提出你的问题,热心的小伙伴会帮你解答。

用户头像
已经输入0个字
发表

该题目由AdrianSong提交,感谢他的无私奉献。提交题目。

关于TOEFL®
App下载
关注我们
联系我们
  • 考满分是专注于出国考试在线科学备考的留学生口碑
  • 品牌。已经服务了超过100万学生 ,累积学员备考记
  • 录超过10亿条,是出国留学考试领域新锐培训机构。