2. 外语
  3. World population will continue rising from the current 5 billion until about 2050, but if the trends of the 1980s continue, it w

World population will continue rising from the current 5 billion until about 2050, but if the trends of the 1980s continue, it w

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问题 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.
选项 A、level up
B、level off
C、level on
D、level down
答案B
解析
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