单项选择题 The hotel manager became suspicious of those people who were loitering in the lobby.（）

单项选择题 Alice Walkers graphic depiction of the lives of Black people in the south has established her as one of the most promising contemporary writers in the states.（）

单项选择题 An increasing proportion of our population, unable to live without advanced medical involvement, will become progressively more reliant on expensive technology.（）