单项选择题

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单项选择题
According to the author, when young families are isolated, ______.
A．old people can easily accept the change
B．people can move from place to place
C．individuals can hardly become innovative
D．economy develops at high speed
单项选择题
In the mass extinction 65 million years ago, ______ of all species on earth vanished.
A．two thirds
B．half
C．90%
D．30%
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