单项选择题

What does the passage mainly discuss

A．The experiments on the common cold.
B．The myths about the common cold.
C．An explanation of why and how people catch colds.
D．The continued spread of the common cold.

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单项选择题

According to the author, sex roles ______.

A．are socially determined
B．are emotionally and physically determined
C．can only be determined by what education people take
D．are biologically and physically determined

单项选择题

Women's place, some people think, is in the protective environment of the home because ______.

A．women can provide better care for children
B．women are too weak to do any agricultural work
C．women are biologically suited to domestic jobs
D．women cannot compete with men in any field