四川的泡菜在全国都是非常有名的一种风味小菜.制作泡菜时要用特殊的坛子,坛口必须加水密封.密封坛口的目的是( )
A:隔绝空气,抑制细菌的繁殖
B:阻止尘埃
C:造成缺氧的环境,利于乳酸发酵
D:防止气体对流,利于醋酸菌进行发酵
⑴This is a photo of Hainan. ____
⑵I got to school by car yesterday.____
⑶Beijing is in the north of China.____
⑷The mountains are really beautiful.____
⑸I went to England last year.____