有关维生素C特性的描述，错误的是（）. A.水溶液中易氧化 B.遇热不稳定 C.碱性
题型：单项选择题
问题：
有关维生素C特性的描述，错误的是（）.
A.水溶液中易氧化
B.遇热不稳定
C.碱性溶液中极易破坏
D.还原型与脱氢型都有生物活性
E.可使羟脯氨酸、羟赖氨酸转化为脯氨酸、赖氨酸
题型：单项选择题
Parents today also worry about their children’s diets. Some doctors give the following advice:
小题1:According to the doctors’ advice ,what does junk food include ?
A．milk and vitamins.
B．Fruits and sugar.
C．Vegetables and salt.
D．Fat, oil, salt and sugar.小题2:In this passage, doctors think that teenagers should eat more ______ .
A．food with no vitamins.
B．fat and sugar
C．vegetables and fruits
D．salt and oil小题3:The best title for this passage is ______ .
A．Bad Habits
B．junk Food
C．unhealthy Food
D．advice on Healthy Eating