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Start of Spring（立春）begins this year on Feb 3 and ends on Feb 17.
Spring Festival.
According to experts, Start of Spring was used for the first time in books during the Western Han Dynasty（206 BC-24 AD）.
Spring is the best season for kite-flying. As a traditional activity, it has a history of more than 2, 000 years. It can help build one's health and keep illness away.
Setting the egg up.
| A．Flying a kite. |
| B．After that everything turns green. |
| C．From then on, Start of Spring was set as the Spring Festival. |
| D．Here are some things you should know about Start of Spring. |
| E．It is said that the egg can be set upright on the first day of Start of Spring. |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
