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Lingling: I'm writing goodbye letters to all my friends at school.
Mum: That's a good idea. What are you writing in your letters?
Lingling: Well, first I write the name of a friend. Look! This one is for Lily. And then I write “Good luck for the future" in every letter.
Mum: Wow! There are about thirty letters here. What a lot of good wishes.
1．Lingling is _______ to her friends. ( )
| A．playing football | B．writing letters | C．having dinner |
| A．the name | B．wishes | C．happiness |
| A．Lily | B．Amy | C．Lingling |
| A．31 | B．13 | C．30 |
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
