2. 外语
  3. Time was when the solar system had two watery worlds. 61) Directly next door to the warm, wet, loamy Earth was the warm, wet, lo

Time was when the solar system had two watery worlds. 61) Directly next door to the warm, wet, loamy Earth was the warm, wet, lo

admin2011-03-22  15
问题    Time was when the solar system had two watery worlds. 61) Directly next door to the warm, wet, loamy Earth was the warm, wet, loamy Mars, both planets covered with oceans and running with rivers—and both possibly teeming with life. Billions of years ago, however, the low-gravity Mars had both its air and water leak away, causing the planet to become the dead, freeze-dried place it is today.
   That is what the prevailing thinking has been. Now, it appears that thinking may be wrong. 62) Recently, NASA released new images from the Mars Global Surveyor spacecraft that suggest water may be flowing up and streaming onto the Martian surface—dramatically increasing the likelihood that at least part of the planet is biologically alive. "If these results prove true," says Ed Weiler, associate administrator of NASA’s Office of Space Science," [they have] profound implications for the possibility of life. "
   Finding liquid water on Mars’ surface has never been easy—because it simply can’t exist there. The modern-day Martian atmosphere has barely 1 percent the density of Earth’s, and its average temperature hovers around 67 degrees Fahrenheit (19 degrees Centigrade). In an environment as harsh as this, water would either vaporize into space or simply flash-freeze in place. 63) Scientists studying Martian history have always looked for clues the planet’s ancient water left behind—tracks where vanished rivers once flowed, basins where vanished seas once stood.
   64) The approximately 65,000 images the Surveyor orbiter has beamed home in the nearly three years it has been circling Mars are full of this kind of expected hydro-scarring. But some of the pictures took scientists by surprise. The older a formation is, the more likely it is to have been distorted over the eons—smoothed by periodic windstorms or gouged by the occasional incoming meteor. However, a few of the newly discovered water channels look fresh. That discovery has lead astonished researchers to conclude that these channels may have been recently formed.
   65) Planetologists have long assumed that if underground water was going to bubble up on Mars, it would have to be somewhere in the balmy equatorial zones, where temperatures at noon in midsummer may reach 68 degrees Fahrenheit (20 degrees Centigrade). Almost all the new channels, however, were discovered at the planet’s relative extremes-north of 30 degrees north latitude and south of 30 degrees south latitude—and all were carved on the cold, shaded sides of slopes.
选项
答案“探测者号”飞船在环绕火星飞行的近三年时间里传回了大约65000张图片，这些图片上面都是人们预想的那种水痕迹。
解析    1) 句式结构
   这是一个带定语从句的复合句，其主要结构为：
   主句：The…images are full of this kind of expected hydro-scarring；定语从句：the Surveyor orbiter has beamed home; 状语从句：in the nearly three years it has been circling Mars
   2) 理解与表达
   本句中几个重点词语的理解：approximately大约地；the Surveyor orbiter“探测者号”飞船；beam传回；circling Mars环绕火星飞行；hydro-scarring水的痕迹
   翻译此句的关键是断句，将原文的长句一分为二。
转载请注明原文地址:https://jikaoti.com/ti/PmasFFFM
本试题收录于： 公共英语四级笔试题库公共英语（PETS）分类
0

公共英语四级笔试

公共英语（PETS）

相关试题推荐
随机试题
最新回复(0)