题目

----Have you decided          the children in the poor area? ----By sending them books and schoolbags. A. how much you will send   B. when you will give C. when will you call          D. how you will help 答案：D已知集合U={1，2，3，4，5，6，7}，A={2，4，5，7}，B={3，4，5}，则（∁UA）∪（∁UB）=（ ）A．{1，6}B．{4，5}C．{2，3，4，5，7}D．{1，2，3，6，7}