单项选择题According to the passage, some slumdwellers are not interested in improving their environments because they______
单项选择题Anna Tibaijuka (Par
单项选择题Why didn't the writer's wife and friends ask him what had happened
单项选择题What does dirty pool at the end of the second paragraph mean
单项选择题From the passage, we can infer that the author is what kind of person