单项选择题

He sent me an （）biography of Theodore Roosevelt which helped me understand American history better.

A. authorized
B. authoritative
C. authoritarian
D. authority

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单项选择题
The manager threw a party（）the group of computer experts from the United States.

A. in honor of
B. in favor of
C. in welcome of
D. in celebration of
单项选择题
It’s a simple bed with a basic metal frame but at the head on the right there is a leather （）for restraining the victims.

A. strip
B. strap
C. stripe
D. slit
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