s are active.
It is hard to say when the sunspots are most violent during their active year but generally one active period is believed to last possibly 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. Every 11 years, the sun, as its energy accumulate inside up to a certain point, will send out streams of charged particles, which affect the earth in different ways.
B. One is that the magnetic field of the earth is much disturbed because of the sun's interference in the inosphere, which is 80 to 500 kilometers above the earth.
C. Scientists also say that the active movement of the charged sun storm also has effects on earthquakes.
D. 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.
E. Ionosphere is high above the earth and so people on the earth are comparatively less affected by it.
F. But the communication situation in each case returned to normal in about 24 hours.
标准答案: F,E,D,C,B
解析:
25、
第六部分:完型填空 (每题1分,共15分)
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,并涂在答题卡相应的位置上。
water
From the beginning, water has furnished man with a source of food and a highway to travel upon. The first civilizations arose __1__ water was a dominant element in the environment, a challenge __2__ man's ingenuity. The Egyptians invented the 365-day calendar in response to the Nile's annual flooding. The Babylonians, __3__were among the most famous lawmaker in ancient times, invented laws __4__ water usage. Water inspired the Chinese to build a 1,000- __5__ canals, a complex system which, after nearly 2,500 years, remains still practically __6__ and still commands the astonishment of engineers. But __7__ never found complete solutions to their water problems. The Yellow River is also known as "China Sorrow"; it is so unpredictable and dangerous __8__ in a single flood it has caused a million __9 __ . Floods slowed the great __10__ of the Indus River Valley, and inadequate drainage ruined __11__ of its land. Today water dominates man __12__ it always has done. Its presence continues to __13__ the location of his homes and cities; its violent variability can __14__ man or his herds or his crops; its routs links him __15__his fellows; its immense value may add to already dangerous political conflicts. There are many examples of this in our own time.
11. A) many B) lot C) much D) a lots
12. A) for B) as C) because D) whereas
13. A) govern B) control C) lead D) influence
14. A) cause B) violate C) kill D) damage
15. A) by B) on C) and D) to
标准答案: C,B,A,C,D
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