All human activities create rubbish. Rubbish can be found in the middle of the ocean, in deserts, and on top of the world’s highest mountain. It can even be found in outer space, where it’s called “space junk”.
A lot of space junk is made up of satellites (卫星) that are no longer in use. It also includes tools and other things from astronauts. Scientists have discovered more than 12, 000 pieces of junk down to 10 cm in size in space. But there are hundreds of thousands of pieces that are too small to be tracked.
Space junk can cause a number of problems. For one thing, an inactive satellite may hit a useful satellite and both may break into pieces, which will create even more junk. Space junk might put other spacecraft (太空飞行器) in danger as well.
One idea for solving this problem is to go to collect the rubbish. A US company is designing a satellite that can collect space junk and move it to an orbit (轨道) where it does not bring any danger.
Space scientists have also realized that this junk is made up of parts that can be reused to build new space stations or satellites. In other words, space junk might be able to be recycled. It is clear that we must take action soon. UK researcher Hugh Lewis recently said that the risk from space junk would rise 50 percent in the next 10 years.
根据材料内容选择最佳答案。【小题1】Why are deserts and mountains mentioned in Paragraph 1? ________
| A．To give reasons. |
| B．To show opinions. |
| C．To share experiences. |
| D．To lead in the topic. |
| A．Found. | B．Recycled. | C．Changed. | D．Collected. |
| A．Causes of space junk. |
| B．Research on space junk. |
| C．Dangers from space junk. |
| D．Conditions of space junk. |
| A．Design some reused space stations or satellites. |
| B．Bring the space junk back to the Earth and burn it. |
| C．Build more new space stations or satellites to hit the useless ones. |
| D．Collect the rubbish and place it in an orbit away from the spacecraft. |
| A．Excited. | B．Proud. | C．Angry. | D．Worried. |
