从1～11这11个整数中任意取出6个数，则下面结论正确的共（ ）个．
①其中必有两个数互质；
②其中必有一个数是其中另一个数的倍数；
③其中必有一个数的2倍是其中另一个数的倍数．
A．3
B．2
C．1
D．0
根据上面的分析可知：从1～11这11个整数中任意取出6个数，①其中必有两个数互质；此说法正确．
③其中必有一个数的2倍是其中另一个数的倍数．此说法正确．
故选：B．
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