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                            Solar Storm
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¡¡¡¡At the end of October 2003, a sudden solar storm hit the earth. A solar storm refers to the large amounts of charged particles released into space_______£¨51£© the solar energy increases. The release of the energy_______£¨52£© place along with the activity of the sunspots with a cycle of: 11 years. This time, the _______£¨53£© of the storm exceeded expectations.
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¡¡¡¡This_______£¨54£© of intense solar storm was caused by the eruption of a solar flare £¨ÉÁ¹â£© and the ejection £¨Åç·¢£© of the solar corona £¨ÈÕ¹Ú£© on October 28, 2003. Large amounts of charged particles moved 150,000,000 kilometers through space toward the_______£¨55£© in 19 hours. They could affect aircraft roaming £¨ÂþÓΣ© in space.
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¡¡¡¡The high-energy particles will_______£¨56£© some of the parts of an aircraft. They may also cause it to fail. High-energy particles can threaten the safety of an aircraft at a high orbit. If an aircraft orbits at a lower orbit, it is_______£¨57£© because it is under the protection of the earth's magnetic field.
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¡¡¡¡A solar storm not only affects aircraft but also is a _______£¨58£© to the environment and humans. The aerosphere and magnetic field of the earth can_______£¨59£© humans from ultraviolet radiation and X-rays. While most of the X-rays are absorbed after they enter the aerosphere £¨´óÆø²ã£©, still a few can_______£¨60£© the ground.
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¡¡¡¡The geomagnetic storm caused by this round of solar storm reaches its highest level on the two_______£¨61£© of the earth, which affects electricity supply of North America. Overexposure to_______£¨62£© threatens the health of passengers on planes flying over the Polar Regions. If we fly in the sky during such a solar storm, it_______£¨63£© we receive ten times the X-ray radiation. It's really damaging.
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¡¡¡¡Scientists say a solar eruption is like the sun sneezing, which will make the earth_______£¨64£© a cold. Though this natural force is irresistible, scientists can still_______£¨65£© its movement accurately by monitoring. Facing successive solar storms, humans can't drop their guard.
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¡¡¡¡51 A since        B when        C until              D though
¡¡¡¡52 A finds        B adjusts        C holds            D takes
¡¡¡¡53 A intensity    B height        C width            D density
¡¡¡¡54 A piece        B part            C round          D set
¡¡¡¡55 A star          B earth          C moon            D sun
¡¡¡¡56 A dominate    B develop      C damage        D descend
¡¡¡¡57 A safe          B dangerous  C comfortable  D manageable
¡¡¡¡58 A limit            B cause        C force            D threat
¡¡¡¡59 A separate    B benefit        C distinguish    D protect
¡¡¡¡60 A lose          B reach          C break          D prepare
¡¡¡¡61 A poles        B mountains    C rivers          D lakes
¡¡¡¡62 A light          B storm          C radiation      D pressure
¡¡¡¡63 A recommends  B means      C proposes      D advises
¡¡¡¡64 A turn            B stop          C become        D catch
¡¡¡¡65 A detect        B start          C experience    D change


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¡¡¡¡51 B¡¡52 D¡¡53 A¡¡54 C¡¡55 B

¡¡¡¡56 C¡¡57 A¡¡58 D¡¡59 D¡¡60 B

¡¡¡¡61 A¡¡62 C¡¡63 B¡¡64 D¡¡65 A