题目

 The library needs _______ , but it’ll have to wait until Sunday. A. cleaning                                                              B. be cleaned C. clean                                                                 D. being cleaned 答案：解析：选A。句意：这个图书馆需要被清扫，但要等到星期天。“需要被……”应用need doing/to be done。故选A。已知函数，其中．（1）判断并证明函数的奇偶性；（2）判断并证明函数的单调性．