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Li Hua will visit his friend John this summer holiday. John’s country is famous for its natural beauty, so he wants to see the beautiful lakes and waterfalls. But he plans to visit Chinatown in Toronto first. Here is Li Hua’s one-way air ticket from Guangzhou to Toronto.
1．选择最佳选项回答问题。
(1) Where does the plane go?
A. To Guangzhou. B. To Canada. C. To the USA.
(2) When can Li Hua get on the plane?
A. On June 23rd. B. On July 23rd. C. On July 24th.
3) Which seat should Li Hua take on the plane?
A. 70A. B. 10y. C. 169.
2．简要回答问题。
(1) What is John’s country famous for?
(2) What will Li Hua do in Toronto?
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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
