277. If you want to get there quickly, you'd better take the track in the forest. The underlined word means ____.

A．a path

B．a car

C．channel

D．a canal

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.