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Mr. Black has two cats. One is big and the other is small. He likes them very much. One day, his friend Mr Green comes to see him, Mr. Green is very surprised(惊讶的). There are(有) two holes(洞) in the door: a big one and a small one. He says, “Why are there two holes in your door?”
“To let my cats in or out,” Mr Black answers.
“Why not one?” asks his friend.
“Can the big cat go through(穿过) the small hole?” Mr. Black says.
1．Mr. Black has a big cat and a small cat.2．There are three holes in the door.
3．The holes are for the little mouse(老鼠).
4．The big cat can’t go through the small hole.
5．The small cat can’t go through the big hole.
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
