单项选择题

The three most important issues (of concern to) citizens today are (prison reform), (abusing children), and toxic (waste).

A．of concern to
B．prison reform
C．abusing children
D．waste
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单项选择题
People thought: Hey, eat a carp and you will be taking in (what) it is that gives you these (fish) their long (life-span). Of course, it (hasn't done) a lot of good for these carp.
A．what
B．fish
C．life-span
D．hasn't done
单项选择题
In deciding to undertake dangerous pursuits, people (usually strive) for their maximum personal ability rating, (when) they (are challenged) but can be victorious, rather than merely (surmounting the mediocre).
A．usually strive
B．when
C．are challenged
D．surmounting the mediocre
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