A community nurse visits a family living in a rural area where the drinking water is not fluoridated. Which of the following would the nurse suggest to the family as the most appropriate means for obtaining a significant amount of fluoride

A. Tea.
B. Yogurt.
C. Citrus juices.
D. Natural cheeses.

Mo和Se的反应活性高，Mo/CIS界面状态对膜的（）有很大影响。