单项选择题

Competition, they believe, ______ the national character rather than corrupts it.

A．enforces
B．confirms
C．intensifies
D．strengthens
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单项选择题
Pine trees, of which them am almost one hundred ______, are found throughout the North Temperate Zone.
A．species
B．differences
C．similarities
D．standards
单项选择题
If you don't ______ the children properly, Mr. Chiver, they'll just run riot.
A．warrant
B．supervise
C．mobilize
D．manipulate
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