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Yesterday I went to a Planetarium with my parents. I got some knowledge (知识) about space. People started to explore (探索) space last century (世纪). In 1965, the former Soviet Union (前苏联) sent people into space for the first time in the world.
The astronaut (宇航员) was Alexei Leonov (列昂诺夫). And he was the first one to walk in space. In 2003, Shenzhou V from China sent Yang Liwei into space. This was China's first space travel. And Yang stayed in space for more than (超过) twenty one hours. It was a great step (步) in China's space exploration.
1．Yesterday I went to Beijing Zoo with my parents.2．People started to explore space in the twentieth century.
3．In 1966, the former Soviet Union sent Alexei Leonov into space.
4．China sent people into space for the first time in 2003.
5．Yang Liwei is the first Chinese to go to space.
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
