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 aggrangements 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 vigorous exercise every day.（）

A．energentic
B．physical
C．regular
D．free

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