单项选择题

Plants with roots appeared about ______ million years ago.

A．430
B．300
C．330
D．100
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单项选择题
The passage suggests that the present-day problem with regard to computers is ______.
A．challenging
B．dramatic
C．psychological
D．fundamental
单项选择题
According to the passage, the initial concern about computer was that they might ______.
A．change our personal lives
B．take control of the world
C．create unforeseen problem
D．affect our businesses
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