单项选择题

The hill was once rich with iron.

A．abundant
B．destitute
C．enough
D．sufficient
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According to the constitution, anyone over the age of 18 is eligible to vote.
A．illegal
B．legitimate
C．required
D．qualified
单项选择题
Put some effort into your work
A．effect
B．force
C．coverage
D．energy
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