休克指数是指
A．脉率+脉压-111
B．脉率/舒张压
C．脉率/收缩压
D．舒张压/脉率
E．收缩压/脉率
参考答案：C
已知全集I={1，3，5，7}，M={1，|a-5|}，M⊆I，M的补集∁IM={5，7}，则实数a的值为（ ）
A．3或8
B．3或5
C．5或8
D．2或8
My good friend is going to_____Canada next month. Because his parents will work there. [ ]
A. leave
B. move
C. be
D. move to
