The carbon dioxide gas given ____ by the fermenting vat was known as "fixed air".
A. off
B. away
C. out
D. up
Giải bởi Vietjack
Đáp án đúng là: A
give off: thải ra
Dịch: Khí carbon dioxide do thùng lên men thải ra được gọi là "không khí cố định".
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