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Mr Brown likes dogs. His two dogs live with him. One is big and the other is small. One day, Mr Smith come to visit him. When he sees two holes (洞) in the door, a big hole and a small hole, he is surprised (惊讶) and says,“My friend, why are there two holes in your door?”
“Let my dogs come in and come out. ”
“But one is enough (足够)”
“But how can the big dog go though (穿过 )the small hole?”
1．Mr Brown has two dogs with him.2．There is only one hole for the dogs.
3．The big dog can go through the small hole.
4．The small dog can come out of the big hole.
5．Mr Brown is Mr Smith’s friend.
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
