单项选择题

Giving the child problems he cannot solve will only frustrate him.

A．baffle
B．worry
C．alarm
D．cultivate
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单项选择题
One word describes what makes Singapore work: discipline.
A．punishment
B．regulation
C．unemployment
D．salary
单项选择题
The plainer is a bowerbird' s plumage, the more brightly it decorates its nest to attract a mate.
A．more spectacular
B．duller
C．flatter
D．more melancholy
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