单项选择题


Questions 9 to 12 are based on the conversation you have just heard.

A．Because he wants to travel to Phoenix.
B．Because he works in the travel agency.
C．Because he goes to see his girlfriend.
D．Because he will go to Florida next week.
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单项选择题
A．Sound travels five times faster through air than through water.B．Sound travels five times faster through water than through air.C．Sound travels three times faster through air than through water.D．Sound travels three times faster through water than through air.
A．Sound travels five times faster through air than through water.
B．Sound travels five times faster through water than through air.
C．Sound travels three times faster through air than through water.
D．Sound travels three times faster through water than through air.
单项选择题
A．At a gas station.B．At a hospital,C．At a bank.D．At school.
A．At a gas station.
B．At a hospital,
C．At a bank.
D．At school.
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