单项选择题

Questions 19 to 22 are based on the conversation yon 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．Its trees.B．Its stone walls.C．Its rock garden.D．Its pronunciation.
A．Its trees.
B．Its stone walls.
C．Its rock garden.
D．Its pronunciation.
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