A year     1     (divide) into altogether 24 solar terms by the Chinese lunar calendar. Start of Spring, the first solar term of the year, begins in early February.     2     lifts the curtain of spring, after which everything turns green and becomes     3     (energy).

Spring is the best season for kite-flying. With     4     available history of more than 2,000 years, the traditional folk activity can help build up one’s     5     (strong) and prevent disease. A breath of fresh air outside can release the dirty smell     6     (collect) in winter.

In China, an old legend goes     7     the egg can be set upright on the first day of the Start of Spring. But according to astronomers and physicists,     8     (set) the egg upright has nothing to do with time, but with mechanics. The most important thing is to shift the egg’s center of gravity to the     9     (low) part of the egg. In this way, the trick is holding the egg until the yolk (蛋黄) sinks as much as possible. For this, people should choose an egg about 4 or 5 days old,     10     yolk is likely to sink down.

Solar terms, which     1     (be) also called Jieqi in Chinese, are days marking one of the 24 time buckets or the solar year in traditional Chinese calendar, used to indicate the alternation of seasons and climate changes in ancient China.

As far back as the Spring and Autumn period, there were four solar terms: mid-spring, mid-summer, mid-autumn    2     mid-winter. After continuous improvement, by the Qin and Han dynasties, 24 solar terms have been     3     (full) established.

The Yellow River Basin in Northern China is believed to be the cradle of the solar terms system. China’s 24 solar terms are a knowledge system and     4     (society) practice formed through observations of the sun’s annual motion and cognition of the year’s changes in season, climate and phenology. Ancient Chinese divided the sun’s movement through the sky     5     24 segments, with each segment     6     (equal) one roughly two-week-long “solar term”.     7     (base) on the sun’s position in the zodiac, the 24 solar terms were created by farmers in ancient China     8     (guide) the agricultural affairs and farming activities. They serve as an instruction manual of sorts for farmers, allowing them to know     9     conditions to expect or what agricultural activities to carry out during certain periods of the year.

Solar terms are often called “the     10     (five) great invention” of China after paper making, printing, gunpowder and the compass.

Spring usually     1    (begin) on February 3-5 every year. From this day on, the days get longer and the weather gets     2    (warm). In addition, from this day to summer, we usually call this period the spring. Besides, it's also a traditional festival in China --- on behalf of the beginning of the new year. So it     3    (value) greatly by Chinese people. There exists the popular custom of eating spring rolls and cakes on that day, so it has another saying of biting spring.