单项选择题

A scientist will come to give us a talk ______ computer.

A．at
B．on
C．of
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单项选择题
A．speak toB．sayC．talk about
A．speak to
B．say
C．talk about
单项选择题
A．better and betterB．many and manyC．little and little
A．better and better
B．many and many
C．little and little
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