环境承载力是指[ ]
A．环境能持续供养的人口数量
B．衡量人口数量的重要指标
C．制约经济发展的主要指标
D．环境所能容纳的最大人口数
答案：A
I don't think she is a nice woman; I am _____ her empty talk.[ ]
A. grateful for
B. tired of
C. crazy about
D. concerned about
