题目

 ____ from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunrise. A. Freed                            B. Freeing                   C. To free                    D. Having freed 答案：A已知命题p：随机变量x～N（2，σ2），且p（x＞3）=0.3010，则p（1≤x＜2）=0.1990，命题q：若向量a，b满足|a|=1，|b|=3，a与b夹角为π3，则|a+b|=7．下面结论正确的是（　　） A、（￢p）∨q是真命题B、p∨q是假命题C、p∧q是真命题D、p∧（￢q）是真命题