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  3. In July of 1994, an astounding series of events took (31) . The world anxiously watched as. every few hours, a hurtling chunk of

In July of 1994, an astounding series of events took (31) . The world anxiously watched as. every few hours, a hurtling chunk of

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问题     In July of 1994, an astounding series of events took (31) . The world anxiously watched as. every few hours, a hurtling chunk of comet plunged into the atmosphere of Jupiter. All of the twenty-odd fragments, collectively (32) ______comet Shoemaker-Levy 9 after its discoverers, were once part of the same object, now dismembered and strong out along the same orbit. This cometary train, glistening like a string of pearls, had been first glimpsed only (33) ______ few months before its fateful impact with Jupiter, and rather quickly scientists had predicted (34) ______ the fragments were on a collision course with the giant planet. The impact caused (35) explosion clearly visible from Earth, a bright flaming fire that quickly expanded as each icy mass incinerated itself. When each (36) ______ shammed at 60 kilometers (37) ______ second into the dense atmosphere, its immense kinetic energy was transformed (38) ______ heat, producing a superheated fireball that was ejected back through the tunnel the fragment had made a few seconds earlier. The residues from these explosions left huge black marks on the face of Jupiter, some of (39) ______ have stretched out (40) ______ form dark ribbons.
    Although this impact (41) ______ was of considerable scientific import, it especially piqued public curiosity and interest. Photographs of each collision made the evening television newscast and were posted (42) ______the Internet. This (43) ______possibly the most open scientific endeavor (44) ______history. The face of the largest planet in the solar system was changed before our very eyes. And (45) ______ the very first time, most of humanity came to fully appreciate the fact (46) ______ we ourselves live on a similar target, a world subject to catastrophe by random assaults (47) ______ celestial bodies. That realization was a surprise to many, but it should not have been. One of the great truths revealed by the last few decades of planetary exploration is that collisions (48) ______ bodies of all sizes are relatively commonplace, at least in geologic (49) ______, and were even more frequent in the early solar (50)______.
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