On April 2, we said goodbye to Tiangong I, China’s first space lab. According to the China Manned Space Agency (中國載人航天), Tiangong I re-entered the Earth’s atmosphere (大氣層) and some of its debris (碎片) fell into the South Pacific Ocean.

There are many spacecraft (宇宙飛船) that are still in orbit

(軌道) 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 re-entry. Experts calculate (計算) the path of the falling spacecraft and its speed. Thy 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 re-entry, 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.

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

2.When the spacecraft finishes its trip, it will .

A. burn up and disappear B. speed up and fly back to the Earth

C. enter another orbit and stay in space D. re-enter the Earth’s atmosphere

3.From the passage, we know there are types of re-entries.

A. one B. two C. three D. four

4.Which of the following is TRUE about the US space station Skylab?

A. It came back in a controlled re-entry. B. Some people were hurt by its debris.

C. Parts of it fell in western Australia. D. It was directed to fall into the ocean.

5.This story most probably comes from .

A. a story book B. a movie review

C. a science magazine D. a government report

1.A 2.D 3.B 4.C 5.C 【解析】短文大意：2018年4月2日，中國第一個太空實驗室天宮一號目標飛行器已再入大氣層，部分殘骸落入南太平洋。許多航天器在完成使命后都會像天宮一號一樣重新進入地球大氣層。有兩種類型的重新進入方式：控制再入和不受控制的再入。在返回期間，大部分航天器在穿過地球大氣層時會燒毀。只有少量的碎片會到達地面，落入大海。 1.細節(jié)理解...
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