题目

 There are many new central leaders in China now, ________ many once worked in the western provinces. A．in which      B. of whom                         C．in whom                 D．for whom 答案：B 判断下列语句是否是命题，请说明理由． (1)陆地面积比海洋面积小； (2)x2＋1＞2x； (3)我们的祖国像花园； (4)对边平行且相等的四边形是平行四边形； (5)两奇数之和为偶数．