单项选择题

A．To revolutionize research and develop speed.
B．To revolutionize travel and shatter speed records.
C．To revolutionize flight and explore outer space.
D．To revolutionize exploration and increase experienc
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单项选择题
A．70°FB．80°FC．75°FD．65°F
A．70°F
B．80°F
C．75°F
D．65°F
单项选择题
A．A revolutionary NASA jet was destroyed in its first flight.B．A booster rocket veered out of control and tumbled to the ground.C．A booster rocket was destroyed after it fulfilled the task.D．A revolutionary NASA jet was destroyed after many flights.
A．A revolutionary NASA jet was destroyed in its first flight.
B．A booster rocket veered out of control and tumbled to the ground.
C．A booster rocket was destroyed after it fulfilled the task.
D．A revolutionary NASA jet was destroyed after many flights.
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