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Han Xue: Hey, Lin Hai. Next Thursday is the 100th birthday of the Communist Party of China （中国共产党）. We plan to have a special class meeting. 1． you have any good ideas?
Lin Hai: Let me think—hmm. We could do some activities among our classmates, 2． as telling the history of our Party, reading poems, singing red songs and so on.
Han Xue: I don’t 3． them, these activities are all meaningful. But maybe the time is not enough.
Lin Hai: That’s true. Do you want to just tell the history of our Party?
Han Xue: I guess so. As our Party is very great, and its history must be educational.
Lin Hai: I agree 4． you. But just telling the history of our Party may be a bit boring. Perhaps we can sing red songs after telling the history of our Party.
Han Xue: Good idea! 5． make a plan right now.
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
