What can we learn about the future development of the Kolibree? A．The brush handle will be removed. B．A mobile phone will be built into it. C．It will be used to fill holes in teeth. D．It will be able to check users' teeth.
A.The B. B．A C. C．It D. D．It E.
【参考答案】
D 由文章最后一段中最后一句“thecameracanevenexamineholesinyourteethwhileyoubrush．'可知，未来牙刷会协助人们“check”(检查)牙齿。