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Peter is looking at the old photos of his school. There was only one building 10 years ago. And there was no dining hall or gym at that time. The school is very different now. It is bigger and better than before. There are more buildings and classrooms. There is a big gym next to the new buildings. Students can play football and have a race there. The dining hall is behind the buildings. The school lunch food is very delicious. All the students love to have lunch there. How wonderful!
1．判断正(T)误(F)。(1) Peter could have lunch in the dining hall ten years ago.
(2) The big gym is next to the new buildings.
(3) Students can play basketball and have a race in the gym.
2．回答问题。
(1) Were there a lot of buildings in the old school ten years ago?
(2) Did the school change a little?
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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
