The Tsimané people from Bolivia have the world's healthiest hearts. They have almost no risk of heart disease. Their plant-based diet and physical activity mean they also have low blood pressure, and low levels of cholesterol and blood sugar. They have a strong cardiovascular system. This avoids many of the major killers, such as heart attack. An 80-year-old Tsimané person is the same cardiovascular age as an American in their mid-50s.
       A researcher said, “Coronary disease could be avoided if people adopted elements of the Tsimané lifestyle, such as not smoking and being physically active.”He said the  Tsimané  have very little coronary disease, but noted this was difficult to achieve in the industrialized world.

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1.Why do Tsimané people have almost no risk of heart disease?

A Because of smoking.

B Because of their unbalanced diet.

C Because of not being physically active.

D Because of their plant-based diet and physical activity.

解析：选D。细节理解题。根据第一段第二、三句They have almost no risk of heart disease. Their plant-based diet and physical activity mean they also have low blood pressure, and low levels of cholesterol and blood sugar.可知，故选D。

2.What can a strong cardiovascular system avoid?

A This can avoid a cold.

B This can avoid sickness.

C This can avoid heart attack.

D This can avoid traffic accident.

解析：选C。细节理解题。根据第一段第四、五句They have a strong cardiovascular system. This avoids many of the major killers, such as heart attack.可知，故选C。

3. An 80-year-old Tsimané person is the same cardiovascular age as an ___American.

A 35-year-old

B 45-year-old

C 55-year-old

D 65-year-old

解析：选C。细节理解题。根据第一段最后一句An 80-year-old Tsimané person is the same cardiovascular age as an American in their mid-50s.可知，故选C。

4.How to avoid coronary disease?

A Enjoy the life.

B Sing and dance.

C Play computer games.

D Learn the lifestyle of Tsimané.

解析：选D。细节理解题。根据第二段第一句A researcher said, “Coronary disease could be avoided if people adopted elements of the Tsimané lifestyle, such as not smoking and being physically active.”可知，故选D。

5. Why is it difficult for us to have very little coronary disease?

A Junk food is popular.

B People like smoking.

C We are in a peaceful world.

D We are in the industrialized world.

解析：选D。细节理解题。第二段最后一句He said the Tsimané have very little coronary disease, but noted this was difficult to achieve in the industrialized world.可知，故选D。