A. Revelation of the nature of comets
B. A perfect representative of the comets
C. Hoping for the best
D. Right time and right place for the Impact
E. What to expect of this Deep Impact
F. Mystery in the heavens
On Monday at 1:52a.m. ET, a probe deployed by a NASA spacecraft 83 million miles from home will smash at 23,000 mph into an ancient comet the size of Manhattan, blasting a hole perhaps 14 stories deep.
41. ( )
Launched in January, NASA’s $333 million Deep Impact mission is designed to answer questions that scientists have long had about comets, the ominous icebergs of space. This is the first time any space agency has staged such a deliberate crash. Scientists hope images transmitted by the probe and its mother ship will tell them about conditions in the early solar system, when comets and planets, including Earth, were formed. The team hopes to release photos of the impact as soon as they are received
A. Revelation of the nature of comets
B. A perfect representative of the comets
C. Hoping for the best
D. Right time and right place for the Impact
E. What to expect of this Deep Impact
F. Mystery in the heavens
On Monday at 1:52a.m. ET, a probe deployed by a NASA spacecraft 83 million miles from home will smash at 23,000 mph into an ancient comet the size of Manhattan, blasting a hole perhaps 14 stories deep.
41. ( )
Launched in January, NASA’s $333 million Deep Impact mission is designed to answer questions that scientists have long had about comets, the ominous icebergs of space. This is the first time any space agency has staged such a deliberate crash. Scientists hope images transmitted by the probe and its mother ship will tell them about conditions in the early solar system, when comets and planets, including Earth, were formed. The team hopes to release photos of the impact as soon as they are received
Passage Three
It is hard to imagine a more perfect gift than a fine watch, which lasts a lifetime and can become a family heirloom (传家宝). "Other gifts that you give don’t last very long," says vice president Karl-Friedrich Scheufele of Geneva-based Chopard. "And there are very few that stay with the person wherever they go. This is the amazing thing about watches -- they are both beautiful and intimate. You have one on your wrist, and you remember a happy time in your life when you look at it."
For something so personal, choosing the right watch demands corresponding care. Here is a brief look at some trends watch buyers will encounter this season.
The most obvious trend in watches this season is the overwhelming popularity of sports watches in stainless steel. Yellow gold and two-tone watches of gold and steel are out -- and full steel is in.
With the steel trend comes sportiness (花哨), which has been the industry&r
A. it can last a very long time
B. everyone needs a watch
C. it stays with the gift receiver
D. it is a witness of a person’s happy moments
Despite the fact that comets are probably the most numerous astronomical bodies in the solar system aside from small meteor fragments and the asteroids, they are largely a mystery. Scientists do not know exactly what comets are or where they come from. Educated guesses are the best we have in hand.
Considering the role of comets in legend and the memory of man, it is remarkable that we still know so little, relatively, about them. The most famous comet of all, Halley’s Comet ( named for the man who predicted its return), was first sighted by the Chinese in 240 B．C．, and it has returned to terrify the people of the world on a regular basis every since then. The ancient considered it an object of ill omen. By mysterious coincidence, the arrival of Halley’s Comet coincided with such events as the battle of Hastings in 1066, the Jewish revolt of 66 A．D．, and the last battle of Attila the Hun against the Romans. Nor is it the only comet to fill man with awe, but me
A. began their discovery earlier than the professionals
B. tend to be the leaders in the area of astronomy
C. have some advantages in discovering new comets
D. established some theories on how comets come into being
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