单项选择题

A．The long, cold winters.
B．Bad traffic at peak times.
C．Noise from garbage trucks.
D．So many police officers on the street.
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单项选择题
A．To show how simple the mechanical aids for diving can be.B．To provide an excuse for his changeable character.C．To explore the philosophical issues of space travel.D．To explain why he took up underwater exploration.
A．To show how simple the mechanical aids for diving can be.
B．To provide an excuse for his changeable character.
C．To explore the philosophical issues of space travel.
D．To explain why he took up underwater exploration.
单项选择题
A．At a booking office.B．In a Hong Kong hotel.C．On a busy streetD．At an airport.
A．At a booking office.
B．In a Hong Kong hotel.
C．On a busy street
D．At an airport.
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