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 8.5 tons．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．

8．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

9．When the spacecraft finishes its trip，it will_____

　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

10．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 injured by its debris．

C. It was hard to tell where it would fall in advance．

D. 1t was directed to fall into the ocean．

11．This story most likely comes from

A. a storybook B. a government report

C. a science magazine D. a movie review