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
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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
单项选择题
In her description of the brain as an interpreter of message from the nervous system, Henderson cautioned that interpreters, however proficient, are fallible and can______ communications.
A．disclose
B．convey
C．impede
D．distort
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