单项选择题A．It’s open only to teachers and postgraduates.B．He can study there if he is writing a research paper.C．Senior students can enjoy more rights than other undergraduates.D．He needs the approval of his professor for the use of it.

单项选择题A．By reading her polished essay.B．By proofreading her first draft.C．By bringing her some reference books.D．By examining her outline.