题目

.  Water can absorb and _______ a lot of heat without big changes in temperature.   A. give up                        B. give out                    C. give away                    D. give off 答案：D若函数，则使的x0的取值范围为 [     ]A．(-∞，1]∪(3，+∞)B．(-∞，2]∪(4，+∞) C．(-∞，2)∪(3，+∞) D．(-∞，3)∪(4，+∞)