2016年职称英语考试《综合B》概括大意真题

Tunguska Event

1 A hundred years ago this week, a giganticexplosion ripped (撕裂) open the dayy above a forest in western Siberia, leaving ascientific riddle that endures tothis day.

2 A dazzling light pierced the heavens,followed by a shock wave as strong as1,000 atomic bombs. The explosionflattened 80 million trees across an area of2,000 square kilometers. Thefireball was so great that, a day later, Londonerscould read their newspapersunder the night sky. What caused the so-calledTunguska Event, named after thenearby Podkamennaya Tunguska river, still remainsa mystery.

3 Experts suspect it was a rock that, aftertraveling in space for millions ofyears, was destined to crash to Earth atexactly 7:17 a.m. on June 30, 1908. Thispossibility worries scientists.“Imagine an unspotted asteroid (小行星) hitting asignificant chunk(块) of land ... and imagine if that area, unlike Tunguska,werepopulated,” the British science journal Nature commented recently.

4 But no fragments of the “rock” have everbeen found. Finding such evidencewould be important, for it would increase ourknowledge about the risk posed bydangerous Near Earth Objects (NEOs), sayItalian researchers Luca Gasperini,Enrico Bonatti and Giuseppe Longo. When thenext Tunguska NEO approaches,scientists will have to decide whether to try todeflect (使偏转) it or blowit up inspace.

5 However, several rival theories for theTunguska Event exist. WolfgangKundt, a professor at Germany's Bonn University,believes the Tunguska Event wascaused by a massive escape of 10 million tonsof methane(甲烷)-rich gasfrom deepwithin earth's crust. Some people hold that the explosion was causedby an alienspaceship crash, or a black hole in the universe.

23. Paragraph 2

24. Paragraph 3

25. Paragraph 4

26. Paragraph 5

A. Competing Explanations

B. Unknown Attacks

C. Mysterious Explosion

D. Star War

E. Importance of Finding Evidence

F. Explanation that Worries Scientists

27. The giganticexplosion that occurred a hundred years ago

28. The shock wavewhich followed the dazzling light

29. The hypothesisthat the explosion was caused by a rock colliding with theEarth

30. Wolfgang Kundt,who has developed an alternative theory

A. has remained a puzzle

B. lacks sufficient evidence

C. is a university professor

D. was generated by the explosion

E. will kill many animals

F. are attacked by aliens

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