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Sandy: where are you from?
Dongdong: I’m from China. Excuse me. Who’s this?
Sandy: This is my friend, Cody. She’s Australia.
Cody: Nice to meet you! Is Dongdong your first name?
Dongdong: Yes, my last name’s Wang.
Cody: Is Bill your brother ,Sandy?
Sandy: Yes, we’re twins.
（1）Sany and Billy are________.
（2）Cody and Dongdong are Sandy’s_________.
（3）Cody is from________.
（4）Dongdong is his _______name.
（5）Dongdong is __________(国籍)
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
