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本单元我们学习了有关圣诞节的一些知识。下面是一篇介绍圣诞节的范文，你可以参照它来介绍自己最喜欢的节日。
范文：
Christmas
Christmas is a Western holiday. It’s on December 25th. At Christmas, people don’t work. Children don’t go to school. They put up Christmas trees. They put the lights on the trees. They invite their family and friends. They give gifts to their family and friends. They sing songs. They have fun together.____________________________________________________________________________________________
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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
