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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 (惊奇的). He finds there are two holes (洞) in the door, a big hole 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 (通过) the small hole?” Mr. Black says.
1．Mr. Black has2．There are two
3．Mr. Green is Mr. Black’s
4．The small cat can go
5．Mr. Green is very
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
