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
Mass production is（）only in an economy with a highly developed technology.

A. feasible
B. permissible
C. allowable
D. receivable
单项选择题
She felt a bit（）in the autumn air so she went in to fetch a coat.

A. chilly
B. fresh
C. shivering
D. cool
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