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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单项选择题
Trading companies put up the money for the first English colonies in North America.
A．supplied
B．earned
C．needed
D．borrowed
单项选择题
In prehistoric times people seldom stayed anywhere for very long because their food supply usually ran out.
A．became depleted
B．was stolen
C．escaped
D．spoiled
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