题目

---He failed again. ---The     of too much time to computer games leaves too little time for studying. A．use           B．cost          C．devotion            D．expense 答案：C6．设全集U={x|-6＜x＜6}，集合A={x|-1＜x≤2}，集合B={x|0＜x＜3}，求A∩B，A∪B，∁U（A∩B），∁U（A∪B），∁UA∩∁UB．∁UA∪∁UB．