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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单项选择题

The public schools of the 1950's and 1960's faced all of the following EXCEPT

A．an inadequate number of school buildings
B．old-fashioned facilities
C．a shortage of teachers
D．a declining number of students

单项选择题

The mountain-climbers took every________to minimize the dangers of their trip.

A．caution
B．means
C．warning
D．precaution