单项选择题

At first _________ it looked like a simple accident, but later the police became suspicious.

A．sight
B．view
C．attempt
D．glimpse
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单项选择题
The competition among producers of personal computers is _________ a race to get the best.
A．effectively
B．necessarily
C．essentially
D．remarkably
单项选择题
Human development is based not only on inborn biological states, but also on patterns of to social knowledge.
A．access
B．contact
C．acquaintance
D．path
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