It is well-knownthat life expectancy is longer in Japan than in most other countries.A_________(51)report also shows that Japan has the longest health expectancy inthe

world.A healthy longlife is the result of___________(52)in social environment.

Scientists aretrying to work__________(53)exactly what keeps elderly Japanese people sohealthy,and whether there is a lesson to be__________(54)from their lifestylesfor

the rest of us.Should we___________(55)any changes to our eating habits,for instance,or gojogging each day before breakfast?Is there some secret__________(56)in the

Japanese diet thatis particularly __________(57)to the human body?

Anotherfactor___________(58)to the rapid population aging in Japan is a decline in birthrate.Although longer life should be celebrated,it is___________(59)considered a

social problem. Thenumber of older people had_________(60)in the last half century and that hasincreased pension and medical costs.The country could soon

be__________(61)aneconomic problem,if there are so many old people to be looked_________(62)andrelatively few younger people working and paying taxes to support

them.

__________(63)theretirement age from 65 to 70 could be one solution to the problem. Work cangive the elderly a____________(64)of responsibility and mission in life.It's

important that theelderly play active_________(65)in the society and live in harmony with allgenerations._________(59)

A.therefore

B.actually

C.even

D.however