Chuyên đề 4 : Reading có đáp án

For example, in Iran, a thin covering of oil was poured on sandy areas to retain (8) for planting trees, butthis method may harm the environment.

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For example, in Iran, a thin covering of oil was poured on sandy areas to retain (8)                        for planting trees, butthis method may harm the environment.

fertilizer

soil

earth

water

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Chọn đáp án D