26.Inhabitants in the three mountain areas are described in order to ______.

A.show their different characters

B.give different examples of longevity

C.introduce different parts of the world

D.illustrate differences among old people

27.All of the following are the reasons for Hunzukuts’longevity EXCEPT ______.

A.Hunzukuts have very nice surroundings

B.their diet is high in nutrition and fat

C.they are far away from noisy cities

D.they are active in physical work

28.The three peoples can be arranged according to the amounts of meat they eat—from the greatest to the smallest—in the following order:

A.Hunzukuts,Caucasians,Vilcabambans

B.Vilcabambans,Hunzukuts,Caucasians

C.Caucasians,Hunzukuts,Vilcabambans

D.Caucasians,Vilcabambans,Hunzukuts

29.Vilcabambans seldom get sick because ______.

A.they often go to health clubs

B.they eat a lot of meet every day

C.they enjoy an agreeable climate

D.they drink the local red wine daily

30.According to the passage,the key to longevity is ______.

A.healthful environment and food source

B.balanced diet and freedom from worry

C.physical exercise and calmness of mind

D.physical exercise and fresh air and water