偏头痛最常见的类型是（）。 A.典型偏头痛 B.群集性头痛 C.普通偏头痛 D.眼肌
题型：单项选择题
问题：
偏头痛最常见的类型是（）。
A.典型偏头痛
B.群集性头痛
C.普通偏头痛
D.眼肌瘫痪型偏头痛
E.基底动脉型偏头痛
题型：单项选择题
The temperature is rising again in the Arctic. The sea ice area has dropped to one of the lowest levels on record， climate scientists reported last week.
“The new Arctic Report Card tells a story of widespread and continued effects of a warming Arctic，” said Jackie Richter-Menge of the US’s Cold Regions Research and Engineering Laboratory.
“This isn’t just a climatological (气候学的) effect. It impacts the people that live there，” she added.
Scientists concerned about global warming focus on the Arctic because that is a region where the effects are expected to be felt first， and that has been the case in recent years.
There was a slowdown in Arctic warming in 2009， but in the first half of 2010 warming was near a record pace. The monthly readings were over 4 degrees Celsius above normal in northern Canada， according to the report card. The report card was prepared by 69 researchers in eight countries.
Researchers said last winter’s big snow storms that struck some Northern countries were tied to higher Arctic temperatures.
“Normally the cold air is bottled up in the Arctic，” said Jim Overland of the US National Oceanic and Atmospheric Administration. “But last December and February， winds that normally blow west to east across the Arctic were instead bringing the colder air south，” he said.
“As we lose more sea ice... warming in the atmosphere can create more of these winter storms，” Overland said.
There is a powerful connection between ice cover and air temperatures， Richter-Menge explained. When temperatures warm， ice melts. When ice melts it shows darker surfaces underneath ， which absorb more heat. “That， in turn， causes more melting and on the cycle goes，” she said.
In September the Arctic sea ice extent was the third smallest in the last 30 years， added Don Perovich of the US Army Laboratory. He said the three smallest ice covers have occurred in the last four years.
小题1:Scientists care so much about the warming in the Arctic region because .
A．the climate in the Arctic doesn’t change much
B．global warming effects are most serious in the Arctic region
C．there has been a major decrease of Arctic warming in recent years
D．by studying the region they can make predictions about the future impact of global warming小题2:. Which of the following shows that the Arctic is getting warmer？
A. The surface of the sea ice in Arctic is getting darker and darker.
B. The Arctic sea ice extent has disappeared over the last 30 years.
C. The sea ice extent has increased to one of the highest levels on record.
小题3: What does the underlined word “cycle” refer to？
A．Ice giving off heat when it melts.
B．Higher temperatures bringing more storms.
C．The cause and the result of the melting.
D．The life of the people living in the Arctic getting worse.小题4: According to researchers what led to big snow storms attacking some Northern countries last winter？
A．Higher Arctic temperatures.
B．The melting ice.
C．The cold wind blowing west to east.
D．Cold air bottled up in the Arctic.小题5: What is the main point of the article？
A．Last winter’s big snow-storms.
B．Winds in the Arctic region.
C．Arctic warming and its possible effects.
D．Changes to the life of people living in the Arctic.