单项选择题

A) essential C) reliable
B) available D) responsible

A．essential
B．available
C．reliable
D．responsible
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单项选择题
A) generated C) born B) evolved D) originated
A．generated
B．evolved
C．born
D．originated
单项选择题
A) distinguished C) protected B) different D) isolated
A．different
B．distinguished C) protected
C．isolated
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