China is the homeland of tea. It is believed that China had tea-shrubs as early as five to six thousand years ago, and human cultivation of teaplants (date) back two thousand years. Tea from China, along with her silk and porcelain, began to be known to the world more than a thousand years ago and has been important Chinese export ever since.
At present more than forty countries in the world grow tea totally (produce) 90% of the world's output. All tea trees in countries have their origin directly or indirectly in China. The habit of tea (drink) spread to Japan in the 6th century, but it was not introduced to Europe and America the 17th and 18th centuries. Now the number of tea drinkers in the world is massive and is still on the increase. Chinese tea may (classify) into five categories according to the different methods by which it is processed. Take black tea as an example. Black tea, (know)as "red tea"(hongcha) in China, should be fermented (发酵) before baking: it is a later variety developed the basis of the green tea. The best (brand) of black tea are Qihong of Anhui, Dianhong of Yunnan.