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Sam is my penfriend. He is eleven years old. He is an English boy, but he lives in Beijing now. There are four people in his family: his father, his mother, his sister and him. His father is a policeman. His mother is a nurse. His elder sister, Alice, is sixteen years old. She is a middle school student. Sam is a student at Beijing Primary School. His favourite subjects are science and PE. He likes playing table tennis and surfing the Internet.
1．Sam is an American boy. He is eleven years old.2．Sam’s mother is a doctor.
3．Sam lives in China now.
4．Sam and his elder sister are in the same school.
5．Science and PE are Sam’s favourite subjects.
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
