A、Because it is rare in the world. B、Because the government restricts exports. C、Because it is not a mass market product. D、Beca

Kenya is the third-largest tea producer in the world. Almost all of the tea grown in the East African nation is exported. Black tea is responsible for nearly all of the exports. But some Kenyan farmers have begun growing purple tea. (22)Purple tea was first grown near Mount Kenya, the country’s highest mountain, in 2008. The plant’s color is a sign of a powerful antioxidant called anthocyanin. (23)Some people believe purple tea is better for your health than green or black tea. Lilian Kerio is a biochemist at the Kenya Tea Research Institute. “We have researched a lot on the health benefits from cancerous models to models that have undergone extreme oxidative stress, and we have seen that purple tea actually alleviates the stress in these cells and we have used that to educate our people that purple tea is actually good for your health.”
(24)The Kenya Tea Development Authority says the tea is being shipped to India, Japan and many European countries. Lerionka Tiampati is the director of the Kenya Tea Development Authority. “So as the market warms up to it and as more demand comes up, then we will expand the acreage under the crop but as it is right now, that is the process, so people are getting used to it. But as I said, it is an upmarket product. (25)It is not a mass market product so it’s never really going to replace the CTC, or orthodox teas that you see in the global market.” Only a few stores in Kenya sell purple tea, which has a sweet taste. People who try it often buy more.
Questions 22 to 25 are based on the passage you have just heard.
22.Where was purple tea first grown?
23.What do people think of purple tea?
24.Which countries is the purple tea being shipped to?
25.Why does purple tea never replace the CTC?