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Passage Three
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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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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What was the second most popular housework among men
A．Cleaning the washroom.
B．Carring shopping bags.
C．Taking out the rubbish.
D．Changing the bed sheets.
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