单项选择题

Although it was his first experience as chairman, he ______ over the meeting with great skill.

A．presided
B．administered
C．mastered
D．executed
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单项选择题
There is much I enjoy about the changing seasons, but my favorite time is the from fall to winter.
A．transmission
B．transformation
C．transition
D．transfer
单项选择题
Don't rest on your laurels; ______ your success and start looking for new markets now.
A．add up
B．follow up
C．work up
D．count up
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