问题
单项选择题
A．To inspect the shuttle for potentially critical heat shield damage.
B．To rewire the space station for a permanent power source.
C．To beat the odds to get off the launch pad in the first night-time launch.
D．To make a fiery ascent that turns night into day.
答案
参考答案：B
解析：[听力原文]
What is the major mission of space shuttle Discovery during this trip
