单项选择题

A．A third.
B．Almost half.
C．Less than three-fifths.
D．More than three-fifths.
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单项选择题
A．Less than 6 months.B．2 months.C．6 months or more.D．1 month.
A．Less than 6 months.
B．2 months.
C．6 months or more.
D．1 month.
单项选择题
A．Why species don’t avoid extinction by adapting.B．Why species become extinct at the rate they do.C．Why humans aren’t extinct.D．How many species aren’t extinct.
A．Why species don’t avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren’t extinct.
D．How many species aren’t extinct.
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