A be costly
B be harmful
C save a life
D still open to debate
E reduce the risk of radiation triggering a cancer
F reduced to the minimum
Delaying the age at which screening starts may ______.

A．To take an eight-week evening course on meditation skills and stress-relief.
B．To call for a flee 15-minute shoulder-and-neck massage.
C．To use five family days.
D．To ask for sick leav

A．remains of
B．keeps
C．exists
D．develops