完形填空
阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
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_______(1) the solar energy increases. The release of the energy_______(2) place along with the activity of the sunspots with a cycle of: 11 years. This time, the_______(3) of the storm exceeded expectations.
This_______(4) 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_______(5) in 19 hours. They could affect aircraft roaming (漫游) in space.
The high-energy particles will_______(6) 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_______(7) because it is under the protection of the earth's magnetic field.
A solar storm not only affects aircraft but also is a _______(8) to the environment and humans. The aerosphere and magnetic field of the earth can_______(9) 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_______(10) the ground.
The geomagnetic storm caused by this round of solar storm reaches its highest level on the two_______(11) of the earth, which affects electricity supply of North America. Overexposure to_______(12) threatens the health of passengers on planes flying over the Polar Regions. If we fly in the sky during such a solar storm, it_______(13) 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_______(14) a cold. Though this natural force is irresistible, scientists can still_______(15) its movement accurately by monitoring. Facing successive solar storms, humans can't drop their guard
1 A since B when C until D though
2 A finds B adjusts C holds D takes
3 A intensity B height C width D density
4 A piece B part C round D set
5 A star B earth C moon D sun
6 A dominate B develop C damage D descend
7 A safe B dangerous C comfortable D manageable
8 A limit B cause C force D threat
9 A separate B benefit C distinguish D protect
10 A lose B reach C break D prepare
11 A poles B mountains C rivers D lakes
12 A light B storm C radiation D pressure
13 A recommends B means C proposes D advises
14 A turn B stop C become D catch
15 A detect B start C experience D change
