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
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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
单项选择题
Environmental groups _________ a campaign against the widespread production of genetically modified crops.
A．underwent
B．established
C．regulated
D．launched
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