单项选择题

He is ______ about his chances of winning a gold medal in the Olympics next year.

A．optimistic
B．optional
C．outstanding
D．obvious
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单项选择题
His attention often ______ at lectures. No wonder he failed the exam.
A．branched
B．wondered
C．wandered
D．went out
单项选择题
The precious manuscripts were hopelessly ______ by long exposure in the cold, damp cellar.
A．ruined
B．damaged
C．destroyed
D．harmed
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