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Laifu is my cute dog. It loves to play every day. One day, there was a fire in the house. Sam and I were at home. We called “help”. Because the fire was big. The firefighters couldn't hear us. But the firelighters had a special dog. Its name is Coco. Coco can hear the people. It found Sam, Laifu and me. Then the frefighters helped us out. "Oh, Laifu, you should learn from Coco! Coco is clever than you!" my mother said. Everybody laughed at last.
1．Laifu is cleverer than Coco.2．Laifu helped Sam and me.
3．Coco is the firefighters' dog.
4．Coco can find people in the fire.
5．Laifu can help the blind people.
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
