单项选择题

A．Buy a racing bicycle.
B．Replace the tires on his bicycle.
C．Buying a used bicycle.
D．Sell his old bicycle to the shop.
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单项选择题
A．By burying a water-filled pot among the plants.B．With surface irrigation.C．With spray irrigation.D．By digging a ditch along the plants.
A．By burying a water-filled pot among the plants.
B．With surface irrigation.
C．With spray irrigation.
D．By digging a ditch along the plants.
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