单项选择题

One proposal______ that an observatory built on the other side of the moon will be good for astronomic observation, as there is no atmosphere around the moon.

A．originates
B．speculates
C．pleas
D．illuminates
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单项选择题
Every member of society has to make a______ to struggle for the freedom of the country.
A．pledge
B．warranty
C．petition
D．guarantee
单项选择题
He is too young to be able to______ between right and wrong.
A．distract
B．discern
C．disperse
D．disregard
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