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David is twelve years old. He is a school student. He loves music and sports. He is very busy at the weekend. On Saturday, he and his parents visit his grandpa in the morning. They have lunch at his grandpa’s home. After lunch, they watch a movie together. They have a big dinner at home in the evening. On Sunday, David plays basketball with his friends in the morning. He plays the piano in the afternoon. In the evening, he does his homework.
1．David is eleven years old.2．David loves music and sports.
3．David plays the piano on Sunday evening.
4．David has a big dinner on Saturday evening.
5．On Saturday, David and his parents visit his grandpa in the morning.
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
