单项选择题

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

A．In warm air.
B．In cold air
C．When it reaches the polar region.
D．Only when the clouds are down low.
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单项选择题
A．Living conditions.B．Sunshine and fresh air.C．Air-conditioned houses.D．A few flowers and a few leaves.
A．Living conditions.
B．Sunshine and fresh air.
C．Air-conditioned houses.
D．A few flowers and a few leaves.
单项选择题
A．Shop assistant and customer.B．Post clerk and customer.C．Store keeper and customer.D．Waitress and customer.
A．Shop assistant and customer.
B．Post clerk and customer.
C．Store keeper and customer.
D．Waitress and customer.
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