阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。
A
These long-life hot spots may have the secret to living to 100 or more! From salty, air to midday rest,here are some theories on how residents track the century.
Yarmouth , Canada
Experts say there’s something special in the salty air from the ocean winds causing this seaside coast to boast one of the highest concentrations of Canadian 100-year-old people. Townspeople have fish-rich diets and a stress-free community spirit that keeps them kicking!
Okinawa, Japan
Hara hachi bun me is a Confucian teaching that instructs people to eat until they are 80 % full. This governs each meal these folks eat, meaning they stop eating when they're 80% satisfied. More and more Japanese follow it now.
Nicoya Peninsula , Costa Rica
Many residents here still live a “self-sufficient” life,eating most of the food they grow themselves, which, can be called real natural and green food . This tight-knit community dines on a fibre-rich diet of beans and corn. For people in this placed dinner is the smallest meal of the day.
Icaria，Greece
A short sleep at midday and two cups of herbal tea every day may be the secret-for 100- year-old locals in Icaria. They also love goats' milk, which has unique fatty acids that may protect against age-related infections.
21. Which country’s recipe for long life may come from Confucius’s thinking?
A. Canada. B. Japan. C. Costa Rica. D. Greece.
22. Which of the following probably helps the locals in Icaria live to 100?
A. Breathing the salty air. B. Having a noon break.
C. Drinking tea once a week. D. Maintaining a fibre-rich diet.
23. What contributes to the four long-life hot spots according to the text?
A. Stress-free spirits. B. Fatty acids.
C. Human diet style. D. Ocean climate.
