Trắc nghiệm Chuyên đề 4: Reading có đáp án

The biogas rises to the top of the tank. The pressure from the gas pushes the liquid slurry into (10) . Now people can use both the biogas and the slurry.

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The biogas rises to the top of the tank. The pressure from the gas pushes the liquid slurry into (10)                                  . Now people can use both the biogas and the slurry.

the tank

no tank

the same tank

another tank

Giải thích

Chọn đáp án D