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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单项选择题
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.
单项选择题
What is the purpose of the National Institute of Child Health and Human Development
A．To help all the weak children and women.
B．To study the genes of babies and mothers.
C．To find out what affects healthy development in people.
D．To study why babies are influenced by their environment.
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