题目

    The Queen’s English is now sounding less upper-class, a scientific study of the Queen’s Christmas broadcasts has found. Researchers have studied each of her messages to the Commonwealth countries since 1952 to find out the change in her pronunciation from the noble Upper Received to the Standard Received.    Jonathan Harrington, a professor at Germany’s University of Munich, wanted to discover whether accent （口音） changers recorded over the past half century would take place within one person. “As far as I know, there just is nobody else for whom there is this sort of b 集合M＝{y∈R|y＝3x}，N＝{－1，0，1}，则下列结论正确的是 [　　] A．M∩N＝{0，1} B．M∪N＝(0，＋∞) C．(CRM)∪N＝(－∞，0) D．(CRM)∩N＝{－1，0}