单选题：Why does it take long for people to change their food?

题目分类：英语
题目类型：单选题
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题目内容：

Why does it take long for people to change their food? A．Because labs are not easily accessible to researcher
B．Because some people are reluctant to accept the new die
C．Because food consumption is a culture of conservatio
D．Because some scientists are against the growing lab mea

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{MP3:http://wximg.233.com/NewsFiles/2011-8/29/0/pets201.mp3}

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分类：英语题型：单选题

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