听一段材料，回答下面几个小题。
What was Christa doing when she was selected?
A.She was studying history.
B.She was teaching.
C.She was working as an astronaut.
How many people applied to go on flight STS-5l-L?
A.11,000.
B.3,984.
C.1,948.
What happened to Judy in 1977?
A.She became the second woman into space.
B.She was selected for astronaut training.
C.She got a Ph.D