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Yesterday was Peter’s birthday. He was happy. He had a party and played with his friends. They sang and danced, and took many pictures. Peter’s parents bought him a computer. He was excited. He can search for a lot of things on the computer. He can email his friends in Canada, too. His father told him not to play computer games too often, because it was not good for his eyes.
1．Today is Peter’s birthday.2．Peter sang and danced with his friends on his birthday party.
3．The computer was Peter’s birthday present.
4．Peter can email his friends in China with his computer.
5．Playing computer too often isn’t good for our eyes.
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
