单项选择题A．To see films.B．To read books in the library.C．To attend lectures.D．To visit the Association.

单项选择题A．Because she was a black girl.B．Because she got the highest average in the class.C．Because she wanted to hit the chairman’s wife.D．Because she refused to retake the exam.

单项选择题A．They have difficulty identifying these ceils.B．They aren’t sure how these cells work.C．They’ve learned how to reproduce these cells.D．They’ve found similar cells in other species.

填空题distinguished

单项选择题A．He was very slow in doing things.B．He was the right person to do such a thing.C．He is expected to do such a thing.D．He would never do such a thing.