单项选择题

The frequent ______ from cold to warm weather this spring have caused much illness.

A．transmissions
B．transactions
C．transformations
D．transitions
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单项选择题
We ask for ______ from others, yet we are never merciful ourselves.
A．clemency
B．sincerity
C．selectivity
D．consideration
单项选择题
He was chosen leader by general ______.
A．compromise
B．command
C．consent
D．conviction
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