单项选择题

Passage Two
Questions 29 to 32 are based on the passage you have just heard.

A．45 minutes.
B．60 minutes.
C．90 minutes.
D．40 minutes.
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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.
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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