单项选择题


Questions 26 to 28 are based on the passage you have just heard.

A．Criminals who set the fires on purpose.
B．Natural lightning strikes.
C．Sparks from vehicles.
D．Carelessly discarded cigarettes.
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单项选择题
A．Wearing arm weights while you are swimming.B．Jogging vigorously in one place for a long time.C．Using bicycles that require you use both your arms and legs.D．Walking slowly while swinging your arms back and forth.
A．Wearing arm weights while you are swimming.
B．Jogging vigorously in one place for a long time.
C．Using bicycles that require you use both your arms and legs.
D．Walking slowly while swinging your arms back and forth.
单项选择题
A．At a restaurant.B．At a grocery store.C．At a friend’s house.D．At a supermarket.
A．At a restaurant.
B．At a grocery store.
C．At a friend’s house.
D．At a supermarket.
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