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Mario: Hi.David.What are you doing?
David: Hi，Mario.I'm 1． a book called Discovery.
Mario: What's it about?
David: It's about the life in space.
Mario: Fantastic！Working in space is my dream.
David: Really？What do you want to be when you 2．？
Mario: Guess what？I'm going to be an astronaut，just like Yang Liwei.
David: Oh，great.3．？
Mario: By studying hard and doing more sports.
David: You know，it's not easy to be an astronaut.
Mario: 4．，but nothing is impossible.Anyway，I'll try hard.
David: I hope your dream will 5．.
Mario: Thank you!
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
