单项选择题


Questions 19 to 21 are based on the conversation you have just heard.
Where does the conversation most probably take place

A．In a drugstore.
B．In a supermarket.
C．On the phone.
D．On the Internet.
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In what condition does a typhoon begin
A．When the warmer air meets with the cooler air.
B．When the wind moves faster than 30 meters a second.
C．When the seawater evaporates into the air.
D．When the air gets warmer and warmer.
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