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A: Hi, David. You look worried. 1.
B: My friend Tom invited me to his family party. 2.
A: Family parties are not so serious. A T-shirt and jeans are OK.
B: Really? That’s great! 3.
A: Yes. You can bring some gifts, such as candy, flowers and toys.
B: Well, Tom likes toys very much. I’ll bring one for him.
A: That’s a good idea. Besides, you need to remember two things.
B: What are they?
A: First, get there on time. 4.
B: I’ll remember that. Anything else?
A: 5.
B: OK. Thank you for your advice.
A: It’s a pleasure. Have fun!

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

