单项选择题

A．The lifecycle of trees.
B．The number of trees.
C．The intensity of solar burning.
D．The quality of air.
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单项选择题
A．Fried potatoes.B．Tomato juice.C．Sweet corn.D．Chocolate beans.
A．Fried potatoes.
B．Tomato juice.
C．Sweet corn.
D．Chocolate beans.
单项选择题
A．Listening to some light music.B．Talking about a jazz record.C．Planning a concert.D．Talking about some of their favorite songs.
A．Listening to some light music.
B．Talking about a jazz record.
C．Planning a concert.
D．Talking about some of their favorite songs.
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