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David is from Australia. But he is in China now. He lives in Beijing. He is eight years old. He is a good student. He has lots of hobbies. He likes collecting stamps. He often shows them to his classmates. David also likes playing chess, watching cartoons and playing football. He often watches cartoons with his sister and mom. Sometimes he plays chess with his father. David likes football very much. After school, he usually plays football with his classmates on the playground.
1．David is an English boy.2．David lives in Beijing now.
3．David doesn’t like collecting stamps.
4．David often plays chess with his sister.
5．There are five people in David’s family.
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
