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
He was so ______ at tying fisherman's flies that he was asked to demonstrate his technique at sports fairs and exhibitions.
A．applicable
B．adroit
C．fancy
D．impressed
单项选择题
Your wish to go for a walk does not ______ your leaving the baby alone in the house.
A．rectify
B．notify
C．signify
D．justify
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