单项选择题

Experts from all parts of the world meet yearly in Hiroshima to ________ a conference on atomic war threats.

A．present
B．attend
C．join
D．participate
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单项选择题
The students are eager to know what the weather will be like tomorrow because it will ________ their picnic directly.
A．effect
B．affect
C．infect
D．influence
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