单项选择题

The design of the orbiter indicates ______

A．NASA's determination to continue space exploration.
B．NASA's disadvantage in space technology.
C．the great pressure from Congress on NASA.
D．a heavy defeat for NAS

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单项选择题

NASA plans to design the new space craft to ______

A．control the International Space Station.
B．carry astronauts to the International Space Station.
C．transport equipment to the International Space Station
D．train astronauts in space flights.

单项选择题

When did NASA start working on a successor to the shuttle

A．One year before the Columbia disaster.
B．One year after the Columbia disaster.
C．Immediately after the Columbia disaster.
D．Years before the Columbia disaster.