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B: 1． Please hurry!
A: Why?
B: The library closes at five. 2．
A: Look, Simon! Here’s the book.
B: Don’t shout! 3． It says “please be quiet.”
A: Oh, sorry. What did you find?
B: 4．
A: What’s the book about?
B: 5． I think it’s difficult.
A: Yes, but I can help you.
| A．It’s twenty to five now. |
| B．Look at the library rules. |
| C．A book and a CD. |
| D．It’s about China. |
| E．To the library. |
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
