题目内容

国际远视力表检查时,被检者与视力表的距离应为

A. 2.5m
B. 3m
C. 4m
D. 5m

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下列哪种损伤最严重

A. 酸性烧伤
B. 碱性烧伤
C. 火焰性热烧伤
D. 红外线损伤

What did Speaker 1, Lynn, do a year ago?

What does she say about the community?

Why does Speaker2, Rick, say his online community is "a very 21st-century community"?