单项选择题

Which of the following statements is not true according to the passage （）

A．accuracy ill speed measurement is essential to spaceships
B．the speeds of space vehicles will vary
C．inaccuracies in measurement could cause accidents in space missions
D．a bump could affect the preciseness of the laser-doppler radar

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单项选择题

It can be inferred that （）

A．Henry Ford always tried to avoid waste
B．Henry Ford required total observation once the standards were established
C．Henry Ford always encouraged his workers to make changes oft he products
D．Henry Ford made his own designs of his cars

单项选择题

What did the man mean by saying Take it easy unless you want lead for lunch ( )

A．Put up your hands.
B．Don't move or I'll shoot you.
C．If you want to have lunch, you must listen to me.
D．You go first slowly and we'll have lunch together.