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Look, this is my new friend Jack. He is ten years old. He is an English boy. He has short brown hair and big eyes. He's tall and strong. He has a happy family. There are four people in his family. His father is a doctor. He has blue glasses. His mother is a doctor, too. He has a baby brother. His brother is three years old. They all like China.
1．Jack is an American boy.2．Jack's father has black glasses.
3．Jack's mother is a doctor.
4．Jack's brother is three years old.
5．There are five people in Jack'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
