单项选择题


You will hear three dialogues or monologues. Before listening to each one, you will have time to read the questions related to it. While listening, answer each question by choosing A, B, C or D. After listening, you will have time to read your answer. You will hear each piece once only.
Questions 11-13 are based on the following talk about the Space Shuttle Columbia. You now have 15 seconds to read Questions 11-13.
According to the talk, what will man probably be able to do by the year 2050

A.Establish a large number of projects in Space Shuttle Columbia.
B.Build permanent colonies in space.
C.Construct many energy stations on the islands in the sea.
D.Build filling stations in space to provide fuel for cars on earth.