题干

宇航员在飞船舱外工作时,他们之间的对话必须借助电子通讯设备才能进行,而在飞船舱内却可以直接对话,其原因是(  )

A:太空中噪声太大

B:太空是真空,不能传声

C:用通讯设备对话更方便

D:声音只能在地面附近传播

上一题 下一题 0.0难度 选择题 更新时间:2019-07-15 07:10:10

答案(点此获取答案解析)

B

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LakeLander                                                                                                                    2 hours ago

                Today, a man talked very loud on his phone on a train between Malvern and Reading, making many passengers upset. I wonder how he would react if I were to read my newspaper out loud on the train, I have never had the courage to do it, though.

Pak50                                                                                                                        ···     ·57 minutes ago

                          

     Why not give it a try? Perhaps you should take lessons on a musical instrument. The late musician Dennis Brian is said to have

asked a fellow train passenger to turn off his radio. When his request was refused, he took out his French horn(号) and started

                   to practice.

Angie O’Edema                                                                                                                   ·42 minutes ago

                    I don’t see how musical instruments can help improve manners in public. Don’t do to others what you wouldn’t like to  be  done to yourself. Once, a passenger next to me talked out loud on his mobile phone. I left my seat quietly, giving him  some privacy to finish his conversation. He realized this and apologised to me. When his phone rang again later, heleft his seat to answer it. You see, a bit of respect and cooperation can do the job better.

Taodas                                                                                                                                    ·29 minutes ago

                  I did read my newspaper out loud on a train, and it turned out well. The guy took it in good part, and we chatted happily all the way to Edinburgh.

Sophie 76                                                                                                                                 ·13minutes ago

                 I have not tried reading my newspaper out loud on a train, but ,several years ago, I read some chapters from Harry Porter to my bored and noisy children. Several passengers seemed to appreciate what I did.