单项选择题

To ensure the development and exploitation of a new technology, there must be a constant ______ of several nevertheless distinct activities.

A．interplay
B．implementation
C．improvement
D．exploration
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单项选择题
After thirty years of television, people have become speed watchers . Consequently, if the camera lingers, the interest of the audience ______.
A．broadens
B．begins
C．varies
D．flags
单项选择题
Consider the universal cannibalism of the sea, all of whose creatures ______ one another.
A．hide from
B．ferret out
C．prey on
D．compete against
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