单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A．The amount of rain.
B．The wind direction.
C．The amount of frost.
D．The temperature.

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单项选择题

A．When there are two lines of plants in each windbreak.B．When there is space left for some wind to go through.C．When they are planted around crops.D．When local green trees are planted in windbreaks.

A．When there are two lines of plants in each windbreak.
B．When there is space left for some wind to go through.
C．When they are planted around crops.
D．When local green trees are planted in windbreaks.

单项选择题

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