搜索
Jack has got a bird. It is very clever. Every day Jack speaks to the bird. “Hello!” he says. “Hello!” the bird answers. “I can see you!” says Jack. “I can see you!” says the bird. Jack is not at home one day. A thief (小偷) comes in. He is taking many things. A voice (声音) comes. “Hello! I can see you!” The thief is very afraid, so he does not take any things and rushes out of the house finally.
1．The bird is very clever.2．Jack never speaks to the bird.
3．Jack says “Hello”, this bird can answer “I can see you”.
4．The thief is very afraid, because Jack can see him.
5．The thief does not take anything finally.
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
