单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．You can grow vegetables vertically.
B．You can raise plants in a confined area.
C．You can plant a wide variety of plants together.
D．You can enjoy the beautiful scenery.
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单项选择题
A．Monday morningB．Monday afternoon.C．Wednesday morning.D．Friday afternoon.
A．Monday morning
B．Monday afternoon.
C．Wednesday morning.
D．Friday afternoon.
单项选择题
A．45 minutes.B．60 minutes.C．90 minutes.D．40 minutes.
A．45 minutes.
B．60 minutes.
C．90 minutes.
D．40 minutes.
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