单项选择题

I saw them bending with great ______ over the machines, after 6 hours' working they found the fault.

A．concentration
B．endeavor
C．absorption
D．tolerance
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单项选择题
World population will continue rising from the current 5 billion until about 2050, but if the trends of the 1980s continue, it will ______ at about 9 billion.
A．level up
B．level off
C．level on
D．level down
单项选择题
The people were tired of reform crusades; they wanted no part of an idea that might ttirn into a______.
A．respite
B．reality
C．mistake
D．cause
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