(多选题)26: Recent studies have shown that air inside many homes, office buildings, and schools is full of pollutants such as ().
A: chemicals
B: smoke
C: bacteria
D: perfume
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(多选题)26: Recent studies have shown that air inside many homes, office buildings, and schools is full of pollutants such as ().
A: chemicals
B: smoke
C: bacteria
D: perfume
(责任编辑:admin) |