单项选择题

What is the main benefit of developing a square - foot garden

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 make a lot of profit.
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Why arc the photographs mentioned referred to as an experiment
A．The photographs were not very clear.
B．The purpose of the photographs was to explain the process.
C．The photographer used inferior equipment.
D．The photographer thought the cat might be injured.
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