Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đáp án (Đề 1)
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Before electricity, what was sometimes passed through pipes to heat rooms? A. Gas B. Petrol C. Steam D. Hot wind

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Before electricity, what was sometimes passed through pipes to heat rooms?

Gas

Petrol

Steam

Hot wind

Giải thích

Chọn đáp án C