更多"The prospects for finding life beyo"的相关试题:
[单项选择]The prospects for finding life beyond Earth may be brightening. Today, scientists are reporting evidence for yet another potential habitat in our solar system: Saturn’s moon Enceladus. Scientists mining new data from the Cassini spacecraft say they may have found evidence that Enceladus—the planet’s fourth-largest moon—hosts liquid water.
If the results hold up, this would bring to four the number of bodies in the solar system—including Earth—that display active volcanism. And since life as biologists know it requires liquid water and a source of energy, Enceladus would join Jupiter’s moon Europa and Saturn’s moon Titan, as well as Mars, as possible spots beyond Earth where simple forms of life may have gained or still maintain a foothold.
The discovery, however, is bittersweet for many scientists. NASA’s proposed budget for fiscal 2007 calls for a 50 percent cut in its astrobiology program. Although the program is a tiny piece of the agency’s overall spending plan for sc
A. Europa, Titan, Earth’s moon and Mars
B. Europa, Mars, Titan and Enceladus
C. Jupiter, Saturn, Mars and Enceladus
D. Earth’s moon, Jupiter, Mars and Saturn
[单项选择]The discovery of life beyond Earth would transform not only our science but also our religions, our belief systems and our entire world-view. For in a sense, the search for extraterrestrial life is really a search for ourselves--who we are and what our place is in the grand sweep of the cosmos.
Contrary to popular belief, speculation that we are not alone in the universe is as old as philosophy itself. The essential steps in the reasoning were based on the atomic theory of the ancient Greek philosopher Democritus. Yet philosophy is one thing, filling in the physical details is another. Although astronomers increasingly suspect that biofriendly planets may be abundant in the universe, the chemical steps leading to life remain largely mysterious.
Traditionally, biologists believed that life is a freak--the result of a zillion-to-one accidental concatenation of molecules. It follows that the likelihood of its happening again elsewhere in the cosmos is infinitesimal. This viewpoi
A. justifying popular beliefs.
B. making comparisons.
C. looking back on history.
D. posing sharp contrasts.
[填空题]All of us who live a busy life may ask this question: how can I find time to read The answer may be 15 minutes a day at any time. No universal formula can be prescribed. Each of us must find our own 15-minutes period each day. It is better if it is regular.
The only requirement is the will to read. With it you can find the 15 minutes no matter how busy the day is. And you must have the book at hand. Not even seconds of your 15 minutes should be wasted when you start to read. Set the book out in advance. Put it into your pocket when you dress. Put another book beside your bed. Place one in your bathroom. Keep one near your dining table.
You can’t escape reading 15 minutes a day, and that means you will read half a book a week, 2 books a month, 20 a year, and 1,000 or more in a life time reading. It’s an easy way to become well read.
How to Find Time to Read
The suitable time may be (46) a day at any time.
It’ll be better if (47)
The only req
