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David and John live with their uncle and aunt in Guangzhou. Their uncle has a son. His name is Sam. Sam is an English teacher. He’s a hard-working man. All of his students like him very much. Every day, David, John and Sam go to school together. They have lunch at the school restaurant at about twelve o’clock. They usually play badminton after school.
1．Sam is David’s brother. （____）
2．David’s uncle and aunt are English teachers. （____）
3．Sam is a good teacher. （____）
4．David, Sam and John have lunch at home. （____）
5．They usually play badminton after school. （____）
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
