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牛津版（深圳·广州）初中英语九年级下册Module 1 Explorations and exchanges Unit 1 Great explorations 第2课时同步习题
On April 2, we said goodbye to Tiangong I, China's first space lab. According to the China Manned Space Agency (中国载人航天工程办公室), Tiangong I re-entered the Earth's atmosphere (大气层) and some of its debris (碎片) fell into the South Pacific Ocean.
There are many spacecraft (宇宙飞船) that are still in orbit (轨道) above the Earth. After finishing their trips, they will all re-enter the Earth's atmosphere like Tiangong I.
There are two types of re-entries: controlled re-entry and uncontrolled re-entry.
Some satellites and manned spacecraft come back to the Earth in a controlled reentry. Experts calculate (计算) the path of the falling spacecraft and its speed. They can guide the spacecraft to fall in a chosen area.
Some spacecraft may have problems while in space after a certain amount of time. These spacecraft come back in an uncontrolled re-entry. It is hard to tell when and where these spacecraft will fall until the last few hours. The US space station Skylab came back partially uncontrolled in 1979. Parts of the station fell in western Australia, but no one was hurt.
During reentry, most of the spacecraft will burn up while passing through the Earth's atmosphere. Only a small amount of the debris will reach the ground. The debris typically ends up falling into the ocean, China Daily reported.
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"Rock, paper and scissors" is a typical game which gave us{#blank#}1{#/blank#} memories in our childhood. It is said that people played it 2,000 years ago in China. Today, people play it {#blank#}2{#/blank#}the world. In Indonesia, it's known as "ant, person, elephant". People in Singapore play "bird, stone, water". People use different hand {#blank#}3{#/blank#}in different countries. But the instruction of the game is the same all over the world.
Many people think "rock, paper, scissors" is all luck. But the game is not {#blank#}4{#/blank#} accidental. A 2014 study in China {#blank#}5{#/blank#} two key patterns in the way people played. The fact is that the winner always repeat his winning hand gestures.
So what's the best way to win this game? Expert players not only think about their next move, but also what their players' next move might be.
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