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
The old scientist decided to move to his core, try home ______ his advanced age and poor health.
A．in the interest of
B．as a result of
C．on account of
D．in support of
单项选择题
Lack of confidence in his own abilities is the chief defect in Mike's character.
A．defeat
B．effect
C．weakness
D．device
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