Agitated Sunspot Cause Trouble
      If the lights in your house keep flickering, blame frequent sunspots. 
      A sunspot is actually charged particles flying at the speed of 3 million kilometers an hour out of the surface of the sun to form sun storms. 
      Every 11 years, the sun, as its energy accumulate inside up to a certain point, will send out streams of charged particles. _____ (1) _____
      One is that the magnetic field of the earth is much disturbed because of the sun’s interference  in the ionosphere, which is 80 to 500 kilometers above the earth. Wireless short-wave communication, which depends on the wave’s reflection against this layer of atmosphere, is likely to be jammed. _____ (2) _____
      Scientists also say that the active movement of the charged sun storm also has effects on earthquakes. According to a research conducted by the Russian scientists from 1957 to 1960, the frequency of earthquakes can be linked to the movement of the sunspots. 
      Little research has been carried out about how exactly the sunspot will negatively harm the health of the people. _____ (3) _____ So, scientists warn that people going outdoors should be careful to protect their exposed skin and eyes with clothes, umbrellas and sunglasses from the strong sunlight rich in ultraviolet rays.
Besides, the nervous system is also affected. _____ (4) _____
      It is hard to say when the sunspots are most violent during their active year, but generally one active period is believed to last possible eight days. Not long ago there were two violent sun storms breaking out , which seriously affected mobile phone communication, etc. in many parts of the world. _____ (5) _____

A. Ionosphere is important to wireless and mobile communication.
B. But the communication situation in each case returned to normal in about 24 hours.
C. Statistics show that traffic accidents are more frequent when sunspots are active.
D. A paper published by a North Korea observatory says that sun storms may cause an increase in the incidence of heart disease and skin disease.
E. It is said that mobile phone communication may be affected too.
F. These charged particles affect the earth, which is directly energized by the sun in a number of ways.