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Li Qing and Li Ping are twins. They’re thirteen. They live with their uncle and aunt in Guangzhou. Their uncle has a son. His name is Li Hai. Li Qing, Li Ping and Li Hai study at Yucai Primary School, but they’re not in the same class.
Li Hai’s parents are teachers. They teach Chinese at Yucai Primary School.They work hard. All their students like them.
The three children go to school together. They eat their lunch at the school canteen. After school, they often play ping-pong together.
（1）Li Qing and Li Ping are brothers.
（2）Li Qing and Li Ping are Li Hai’s cousins.
（3）Li Qing, Li Ping and Li Hai are classmates.
（4）Li Hai’s parents work at the same school.
（5）Li Hai, Li Qing and Li Ping have lunch at 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
