Question 1: From the middle of the 20th century, green tea has been planted

Green tea
Green tea must always be the first to be mentioned whenever one talks about Vietnamese tea. From the middle of the 20th century, green tea has been planted extensively throughout the North and the Middle of Vietnam, gradually becoming a symbol of Vietnamese' everyday life, of the peaceful countryside regions.
Green tea is very amiable to Vietnam' soil and climate, as it can be found widely in not only plain but also highland areas, sometimes right in the family backyard's gardens. With the higher trunk and larger in size of leaves in comparison with other tea plants, green tea can be enjoyed fresh and there is no need to wilt or oxidize; people can enjoy it right after picking the leaves from the tree. Steeping and boiling the tea leaves in hot water, after fifteen minutes, your green tea is ready to be served. Vietnam has been always an agricultural country, since people in rural area earn a living mainly from farming. It is the keeping-cool characteristic that makes green tea a perfect beverage for hot summer days in the tropical land. Besides blowing out the heat from the inside, green tea also helps improving the body's resistance to infection. Unsurprisingly, green tea has been considered an indispensable part of Vietnamese farmers' ordinary life.
Nowadays, acknowledging about Vietnamese ardor for green tea and its positive affects on health, some shrewd producers have convert this folk beverage into canned drink, bringing green tea closer to urban citizens as well as foreigners.