A．They use many different methods.B．All birds follow ma-找考题网

单项选择题

A．They use many different methods.
B．All birds follow major geographical features.
C．All birds use their memory of a map.
D．We have no information about this.

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单项选择题

A．They don’t get rid of flabby arms.B．They can damage arm muscles.C．They aren’t acceptable to most people.D．They can raise one’s blood pressure.

A．They don’t get rid of flabby arms.
B．They can damage arm muscles.
C．They aren’t acceptable to most people.
D．They can raise one’s blood pressure.

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S2. The writer believes that the rhythm of our footsteps changes as

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