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 experience.
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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 tumlJled 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 tumlJled to the ground.
C．A booster rocket was destroyed after it fulfilled the task.
D．A revolutionary NASA jet was destroyed after many flights.
单项选择题
A．Because his wife overheated the house.B．Because his mother overheated the house.C．Because his wife’ s mother overheated the house.D．Because he overheated the house.
A．Because his wife overheated the house.
B．Because his mother overheated the house.
C．Because his wife’ s mother overheated the house.
D．Because he overheated the house.
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