单项选择题

A seed planted in the sensitive lining of an oyster begins a perpetual coating process that forms a pearl.

A．total
B．annual
C．continual
D．habitual
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单项选择题
California, the first city on the American continent, reached its peak of development and power about AD 1100.
A．summit
B．tip
C．height
D．apex
单项选择题
The French and Indian War of 1756-1763 pitted Britain, her American colonists, and her Indian allies against France, her Canadian colonists, and her Indian allies.
A．armed
B．pivoted
C．set
D．took
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