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），Tiangong I re-entered the Earth’s atmosphere (大气层) and fell into the South Pacific Ocean.
There are many spacecraft that are still in orbit above the Earth．They are flying at heights ranging from 300 to 1，000 kilometers．After finishing their trips，they will all re-enter the Earth's atmosphere like Tiangong I．
There are two types of re-entries：controlled（受控的）re-entry and uncontrolled re-entry．
Some satellites（卫星）and manned spacecraft come back to the Earth in a controlled re-entry．Scientists calculate（计算）the path of the falling spacecraft and its speed．They can guide the spacecraft to fall in a chosen area．In 2017，Tianzhou I，China's first cargo（货运）spacecraft，was directed to fall in the South Pacific Ocean．
Some spacecraft may have problems while in space，or are simply no longer usable after a certain amount of time．These craft 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 l979．Parts of the station fell in western Australia，but no one was injured．
During re-entry，most of the spacecraft will burn up while passing through the Earth's atmosphere．Only a small amount of the debris（碎片）will reach the ground．
The debris typically ends up falling into the ocean，China Daily reported．Tiangong I weighs about 8.5tons．The amount of debris that falls to the Earth might be about l to 1.5 tons， the Beijing News reported． That is about the same weight as a car．
【小题1】The debris from Tiangong I ________.| A．fell into the South Pacific ocean |
| B．fell in western Australia |
| C．fell in the central part of the US |
| D．fell into the North Pacific Ocean |
| A．burn up and disappear |
| B．re-enter the Earth's atmosphere |
| C．speed up and fly back to Earth |
| D．enter another orbit and stay in space |
| A．It came back in a controlled re-entry． |
| B．Some people were injured by its debris． |
| C．It was hard to tell where it would fall in advance． |
| D．It was directed to fall into the ocean． |
| A．a storybook | B．a government report |
| C．a science magazine | D．a movie review |
