单项选择题

He pointed out that a (considerable) gap (existing) between the number of hours people (are paid) for working and the number of hours (spent) in productive labor.

A．considerable
B．existing
C．are paid
D．spent
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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
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
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