单项选择题

The underlined part "it" in Paragraph 4 refers to（）

A．a taxi
B．the money
C．a bomb
D．public transport

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单项选择题

He will already have some years of selling in world markets behind him means（）

A．he has already sold things in different parts of the world
B．he has sold toys for some years
C．he has already sold toys all over the world
D．he has already sold things for some years

单项选择题

According to the text, why are test flights most dangerous（）

A．The plane may explode in the air.
B．The pilot may lose control of the plane.
C．The engines may be damaged.
D．Too much air may get into the plan