从方框中选出合适的单词补全下列短文，每词限用一次。

    Beijing is a nice place．There are ____seasons in a year．In ____， It's warm and sunny．In ____， it's hot. In ____，it's always cool and windy. In ____，it's cold． I like cool days and bright sunshine．So I like Beijing's autumn best．

若mn>0,则m,n（   ）

根据植物种子胚中子叶的个数将植物分类为双子叶植物和单子叶植物，单子叶植物种子玉米萌发过程中提供营养的结构是____，种子萌发过程中最先突破种皮的结构是____．

    Tea is an important part of Chinese tradition. The practice of drinking tea has____long history in China, having originated there. Nowadays, Chinese tea generally represents tea leaves which have been processed ____(use) methods inherited from ancient China.

    According to popular legend, tea____(discover) by Chinese Emperor Shen Nong in 2737 BC____a leaf from a nearby shrub fell into the water the emperor was boiling. The Emperor was interested in the new liquid,____ (drink) some carefully, and found it very refreshing. And so, tea was said to be created in 2737 BC.

    Tea is deeply woven into the history and culture of China. The beverage(饮料) is considered one of the seven____(necessity) of Chinese life, along with firewood, rice, oil, salt, soy sauce and vinegar. Around 771 BC—476 BC the Chinese tea was used ____(help) treat some diseases.

    Most Chinese teas are cultivated and consumed in China. Tea shops and tea houses in the street are easily found in China. Meanwhile, they are also exported internationally due____ a rise in the____(popular) of Chinese cuisine worldwide. Tea has become one of Chinese specific drinks in the world. It is ____(common) available in Chinese restaurants and grocery shops world wide.