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China made its first stamps in 1878. The first stamps were of a very big dragon. Behind the dragon, there were clouds and waves. People all over the world love to collect stamps from China. Chinese stamps are famous because there are beautiful. They also show China that history, people, places and animals. Many stamps in China are children’s paintings. People love these stamps. The paintings show that China and the children’s works are very good.
1．Canada made its first stamps in 1878.2．The first stamps were of a very big tiger.
3．People love to collect stamps from China.
4．Many stamps in China were men’s paintings.
5．We can see China’s history on the stamps.
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
