单项选择题

We are (at) a critical point in our nation's history and we cannot go back as individuals or (as a country) to (what) .we were ten, five or even one year (earlier).

A．at
B．as a country
C．what
D．earlier
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单项选择题
Scientists created a (brainy), four-legged robot (resemble) a starfish that can sense (damage) to its body, and (think up) a way to recover.
A．brainy
B．resemble
C．damage
D．think up
单项选择题
Admirers of American ballet (has claimed) that (its stars) can dance (as well as) or even better than (the best of) the Russian artists.
A．has claimed
B．its stars
C．as well as
D．the best of
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