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注：librarian 图书管理员 sign 标识
Brad: Oh, there are so many people in the library.
Henry:
Brad: Some are reading books. Some are looking for books.
Henry:
Brad: I want some books about animals.
Librarian:
Brad: Sorry.
Librarian:
Henry: Thank you very much.
Librarian:
Brad: OK.
| A．I can show you the books. |
| B．Please keep your desk clean. |
| C．Shh. Quiet, please. |
| D．What are they doing? |
| E．What books do you want? |
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
