单项选择题

Until the late nineteenth century,there was no uniform system of time-keeping in the United States.

A．personal
B．efficient
C．consistent
D．practical
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单项选择题
His job was to look after the animals.
A．search for
B．care for
C．follow
D．trap
单项选择题
In the Navaho household,grandparents and other relatives play indispensable roles in raising children.
A．dominant
B．exemplary
C．essential
D．demanding
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