4．B 观点说明题.作者通过列举人.鸟.蜜蜂的非语言性的交流.认为树发出蒸汽的方式也是一种交流是合乎情理的. B The plan: turn Mars into a blue world with streams and green fields, and then fill it with creatures from the earth. This idea may sound like something from a science fiction , but it is actually being taken seriously by many researchers. This suggested future for the “red planet will be the main topic for discussion at an international conference hosted by NASA this week. Leading researchers as well as science fiction writers will attend the event. It comes as NASA is preparing a multibilliondollar Mars research programme. “Turning Mars into a little earth has long been a topic in science fiction, said Dr Michael Meyer, NASA’s senior scientist for astrobiology . “Now, with scientists exploring the reality, we can ask what are the real possibilities of changing Mars. Most scientists agree that Mars could be turned into a little earth, although much time and money would be needed to achieve this goal. But many experts are shocked by the idea. “We are destroying our own world at an unbelievable speed and now we are talking about ruining another planet, said Paul Murdin, of the Institute of Astronomy, Cambridge, UK. Over the past months, scientists have become increasingly confident they will find Martian life forms. Europe and America’s robot explorers have found proof that water, mixed with soil, exists in large amounts on the planet. In addition, two different groups of scientists announced on March 28 that they had found signs of methane in the Martian atmosphere . The gas is a waste product of living creatures and could be produced by microbes living in the red planet’s soil. But scientists such as Dr Lisa Pratt, a biologist at Indiana University, say that these microbes will be put in danger by the little earth project. “Before we have even discovered if there is life on Mars, we are talking about carrying out projects that would destroy all these native lifeforms, all the strange microbes that we hope to find buried in the soil, said Dr Pratt. This view is shared by Monica Grady, a planetary scientist at the Natural History Museum, London. “We cannot risk starting a global experiment that would wipe out the precious information we are looking for. she said. “This is just wrong. 【
查看更多】
题目列表(包括答案和解析)
