单项选择题

A skilled platform speaker outlines the main points before he ______ the speech.

A．speak
B．talk
C．deliver
D．shift
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单项选择题
In order to find an approach ______ with the inconvenient, a world conference net and agreedupon a universal system of standard time.
A．in dealing
B．dealing
C．to dealing
D．to deal
单项选择题
In the future, people will mainly depend on ______ energy.
A．sun
B．solar
C．mine
D．mineral
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