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Daming: Hi, Tony. What are you up to?
Tony: Hi, Daming. I’ve just made a model spaceship for our school project.
Daming: I’m not sure how to make it. 1．?
Tony: Sure, no problem. Have you heard the news? Scientists have sent a spaceship to Mars.
Daming: 2． yet?
Tony: Yes, it has arrived already. That’s why it’s on the news.
Daming: Are there any astronauts in the spaceship?
Tony: 3．.
Daming: Why not? Astronauts have already been to the moon.
Tony: Yes, but no one has been to Mars yet. Lots of scientists are working hard in order to send astronauts to Mars one day.
Daming: That’s interesting! 4． information on space travel?
Tony: You can go online to search for information.
Daming: I will. 5．, Tony.
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
