nasa按send没反应怎么办 nasa按send没反应

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一、题文

   NASA aims to send a man and a woman to the moon by 2024. This is the goal of its Artemis program. But for Artemis to succeed, the U. S. space agency first needs to solve a big problem: the damaging threat of moon dust.Over billions of years, celestial （天体的）bodies, such as asteroids and meteors, have slammed into the moon. These hits have crushed some lunar rocks into dust. The surfs radiation gives the dust an electric charge that makes it stick to everything. Those powdery bits are like u broken pieces of glass" , notes Mihaly Horanyi, a physicist at the University of Colorado Boulder. The dust is so rough, in fact, that it can damage equipment. If taken in, it might even harm an astronaut's health. Horanyi is part of a team that has now figured out how to overcome one troubling aspect of the dust: its static cling, using a low-powered electron beam （电子束）.When shined onto the dust, that beam sends the dust flying.During the 1970s, the astronauts in NASA's Apollo missions relied on a very low-tech system to clean lunar dust off their spacesuits. They swept it away with what looked like the brushes used to paint a house. But the electrically charged nature of space dust tended to fail such hand sweepers.The new electron-beam broom takes advantage of the dust's electrical characteristic. As the beam hits the dust, it releases electrons into the tiny spaces between particles. Some of these negatively charged electrons will be absorbed by the surrounding dust.One problem with the electron beam, at least for now, is that it leaves up to one-fourth of the dust behind. The Boulder group aims to strengthen that cleaning power. Horanyi says the electron beam is just one of several ways future space explorers could keep surfaces clean. Others might include changes to a spacesuit's design.【小题1】Why should the moon dust problem be solved?A．It might affect astronauts' health and equipment.B．It can give off harmful radiation.C．It can stick to the surface of the spaceship.D．It might cause serious crashes.【小题2】What is the main idea of Paragraph 4?A．The discovery of the electron beam.B．The way the electron beam works.C．The occurrence of the electron beam.D．The development of the electron beam.【小题3】What can we learn about the new electron beam broom?A．It is a low-tech dust cleaning system.B．It leaves three-fourths of the dust uncleaned.C．It needs improvement in the cleaning power.D．It is proved less efficient than other methods.【小题4】What will the author most probably talk about next?A．Astronauts' health.B．New spacesuit's designs.C．Spaceship surface features.D．Future space exploration.

二、解答

【小题1】A
【小题2】B
【小题3】C
【小题4】B

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