A．About the cost of living.B．About their safety.C．About-找考题网

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A．About the cost of living.
B．About their safety.
C．About pollution.
D．About traffic jams.

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A．In 15th century.B．In the 17th, century.C．Before 15th century.D．After 17th century.

A．In 15^th century.
B．In the 17^th, century.
C．Before 15^th century.
D．After 17^th century.

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A．The influence of old people in the U.S.B．Changes in American families.C．Citizens and life in the U. S.D．The old people in the U. S.

A．The influence of old people in the U.S.
B．Changes in American families.
C．Citizens and life in the U. S.
D．The old people in the U. S.

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