17.According to the passage, Okinawa is well known for .
A. its beauty B. its centenarians C. its subtropical climate D. its cuisine
18: The people of Okinawa _______.
A. cook very well B. eat a lot of meat C. have an unhealthy diet D. have the longest lifespan
19. Which of the followings is NOT true about the Okinawans?
A. They eat what they fish and grow.
B. They often buy food at the supermarket.
C. They do exercise regularly.
D. They enjoy socializing with friends.
20. The Okinawans live a long life because _______.
A. they have healthy diets and living habits.
B. they walk as much as they can.
C. they love gardening and going fishing.
D. they only eat fruit and vegetables.
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