第6部分：完形填空（第51～55题，每题1分，共15分）

　　下面的短文有15处空白，请根据短文内容为每处空白确定一个最佳选项。

Solar Storm

　　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.

　　This________（54） of intense solar storm was caused by the eruption of a solar flare （闪光） and the ejection （喷发） of the solar corona （日冠） 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 （漫游） in space.

　　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.

　　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 （大气层）, still a few can________（60） the ground.

　　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.

　　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

　　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

同时按下Crtl键和A键查看答案
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