单项选择题

Numerous experiments have demonstrated that mass is ______ to energy.

A．convertible
B．exchangeable
C．transplantable
D．conceivable
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单项选择题
Bill looked everywhere for his dictionary but ______ had to return home without it.
A．in the end
B．at the end
C．in the finish
D．at the last
单项选择题
Did you suspect that the entire episode was an elaborate deception
A．decision
B．death
C．invitation
D．hoax
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