各类营养物质在人体消化道内开始被消化的顺序是( )
①蛋白质 ②淀粉 ③脂肪 ④无机盐 ⑤纤维素.
— Isn't that your new English teacher over there?
— No, it ______ be her. She doesn't have long hair.
食品放在冰箱中能保持一段时间不腐败,主要是因为在冰箱这个环境中( )