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As an old saying goes, “A true friend reaches for your hand and touches your heart.” 假如你叫李华，在你的初中学习生涯中，一定有许多朋友给了你不少帮助。在毕业之际，请给你的好友李雷写一封感谢信。
要点：1. 感谢他（她）对你的帮助。
2. 他（她）是如何帮助你的。
要求：
1. 请结合具体事例，适当发挥；语言通顺，意思连贯。
2. 文中不能出现与本人相关信息。
3. 80词左右（开头和结尾已经给出，不计入总词数）。
Dear Li Lei,
How time flies! We are going to graduate from junior high school. ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Wish you all the best!
Yours,
Li Hua
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
