However, sunspots are mostly missing now.
Since the earth is in close contact with the sun, strong solar activities can bring trouble to our life.
People of the 21 st century rely on hightech systems for the basics of daily life. Air travel and radio communications can be affected by strong solar activities.
A big solar storm could cause 20 times more economic damage than Hurricane Katrina.
What the sun will do next is beyond our ability to predict. Most astronomers think that the solar cycle will go on but at low level. However, there is also evidence that the sun is losing its ability to produce sunspots. By 2015, they could be gone altogether.
文章大意:如果你的手机不能正常工作了,请不要把责任推向服务提供商。这样的故障也许是太阳黑子引起的。
6.The sun watchers feel surprised at________.
A. the longest sunspots' absence
B. the largest sunspot number
C. the malfunction of electronic devices
D. the serious damage by sunspots
答案:A 细节理解题。从文章第二段可知太阳黑子长时间的消失让太阳观测者很吃惊。
7.What does the underlined word “crescendo” in Paragraph 3 most probably mean?
A. small number
B. high level
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