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Dongdong was very excited. His father bought him a computer. It was his birthday present. He could email his friends in Australia. He could do his homework on the computer.
Dongdong wanted to learn drawing and painting on the computer. Peter taught him. Then Peter showed him how to search for a lot of things on the computer. He also showed Dongdong some computer games. He told Dongdong , “Don’t play computer games too often. It is not good for your eyes.”
1．Dongdong’s father gave him a computer for (因为)2．First, Dongdong wanted to learn
3．Could Dongdong do his homework on computer?
4．Why does Peter tell Dongdong not to play compuetr games too often?
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
