单项选择题

Sleep stairs can present a particular hazard to older people.

A. picture
B. danger
C. evidence
D. case
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单项选择题
I want to provide my boys with a decent education.
A. special
B. private
C. general
D. good
单项选择题
Our arrangements were thrown into complete turmoil.
A. doubt
B. relief
C. failure
D. confusion
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