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【单选题】
关于PM2.5,下列哪项叙述有误A.
PM2.5是指大气中直径小于或等于2.5微米的颗粒物
B.
PM2.5的产生主要来源是日常发电、工业生产、汽车尾气排放等
C.
这些颗粒物中大多含有重金属等有毒物质
D.
长期接触可干扰肺部的气体交换
E.
PM2.5是形成雾的主要成分
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举一反三
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【单选题】Why does Colonel Ludlow move his families to a remote part of Montana?
A.
Because he dreams a better life in the mountainous area.
B.
Because he is tired of the fact that the American government betrays the Native Americans.
C.
Because the Native Americans betrays the American government.
D.
Because there are more business opportunities.
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