Trắc nghiệm Chuyên đề 4: Reading có đáp án

In this contained environment, natural bacteria decays the waste material. (8) the waste decays in the bio-digester, it (9) two things – biogas and slurry.

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In this contained environment, natural bacteria decays the waste material. (8)                                the waste decays in the bio-digester, it (9)                             two things – biogas and slurry.

produces

brings

gets

makes

Giải thích

Chọn đáp án A