单项选择题

It is postulated that population trends have an effect on economic fluctuations.

A．challenged
B．assumed
C．deducted
D．decreed
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单项选择题
The stories of Sarah Orne Jewett are considered by many to be more authentically regional than those of Bret Harte.
A．elegantly
B．genuinely
C．intentionally
D．thoroughly
单项选择题
I feel regret about what's happened.
A．sorry
B．disappointed
C．shameful
D．disheartened
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