A:乙醇(C2H6O)
B:甲醛(CH2O)
C:乙酸(C2H4O2)
D:甲醇(CH4O)
—I feel very thirsty and hungry after a long walk.
—Would you like some ________ and ________?
小张家的卫生间按如图所示的电路安装了照明灯和换气扇,它们( )