单项选择题

What is the passage mainly concerned with

A．The impact of the baby boom on public education.
B．Birth rates in the United States in the 1930's and 1940's.
C．The teaching profession during the baby boom.
D．The role of the family in the 1950's and 1960's.
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There are many ______ nowadays in the universities.
A．woman teachers
B．women teacher
C．woman's teachers
D．women teachers
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It was unimaginable that they should have travelled across such an ______ area to look for a lost lamb.
A．extensive
B．expensive
C．expansive
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