题目

Everything seemed to be going_______ for the first two days after I moved to New York.       A. vividly                       B. generally                  C. frequently          D. smoothly 答案：D已知函数 （1）判断函数f（x）的奇偶性，并说明理由；（2）证明：f（x）在（﹣1，+∞）上为增函数；（3）证明：方程f（x）=0没有负数根．