单项选择题

Steep stairs can present a particular hazard to older people.

A．evidence
B．danger
C．case
D．picture
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单项选择题
Our arrangements were thrown into complete turmoil.
A．failure
B．confusion
C．doubt
D．relief
单项选择题
Your dog needs at least 20 minutes of vigorousexercise every day.
A．energetic
B．physical
C．regular
D．free
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