单项选择题

A．strength
B．protection
C．vigor
D．alertness
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单项选择题
A．methodB．procedureC．developmentD．process
A．method
B．procedure
C．development
D．process
单项选择题
A．for themselvesB．by themselvesC．themselvesD．on their own
A．for themselves
B．by themselves
C．themselves
D．on their own
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