44. What does the word irrigation mean in the second paragraph?
(A) Spreading fertilizer on the soil.
(B) Supplying the land with water.
(C) Ventilating fresh air to the land.
(D) Removing the acid from the soil.
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統計: A(55), B(87), C(6), D(15), E(0) #2931738
統計: A(55), B(87), C(6), D(15), E(0) #2931738