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B.How digital means were used.993.The year before,scientists know that a massive solar storm occurred,信息卷C.How the study was conducted.releasing a stream of cosmic (rays,or highly energetic particles,from theD.What differences were discovered.sun at nearly the speed of light.This left behind a noticeable and distinct signature30.What can we infer about favor requests made by digital means?in the tree rings for the year 993.结束后A.They are favored by close friends."The distinct uplift in radiocarbon production that occurred between 992 andB.They are more likely to be declined.993 AD has been detected in tree-ring files from all over the world,"said Michael位号C.They are less common in the office.Dee,lead study author.D.They are suitable for small favors.All three wooden objects show the same signal from the solar storm exactly 29631.What does the underlined phrase"triumphs over paragrppobbygrowth rings before meeting the edge."Finding the signal from the solar storm 29mean?growth rings in from the bark allowed us to conclude that the cutting activity tookA.Defeats.B.Treats.place in the year 1021 AD,"said Margot Kuitems,study co-author and postdoc-C.Separates.D.Reflects.toral researcher at the University of Groningen.DSecuring this date suggests this is the earliest known presence of Europeans inThe Vikings used their longships to cross the Atlantic Ocean and settled inthe Americas ahead of Christopher Columbus."It is thought that the Vikings ven-Canada as early as 1021,according to a new study providing the first exact date oftured(冒险)west to find new raw materials,most notably wood,”Dee said.“ByEuropeans in the Americas.traveling between the continents for such materials,it has been described as theThe study examined wooden objects from a previously undated Viking settle-first step in globalization."ment in Newfoundland,which provide the earliest known record of humans cross-32.What does the new study find about the Vikings reaching Canada?ing the Atlantic to reach the Americas.The site,known as L'Anse aux Meadows,A.The route of their adventure.is located on Newfoundland's northern peninsula.B.The date of their settlement.Researchers decided on a date thanks to two unlikely sources:chopped woodC.The location of their landing.and a solar storm that occurred more than a thousand years ago.D.The celebration of their arrival.When the Vikings reached L'Anse aux Meadows,they chopped (down33.Which provides evidence for the first presence of the Vikings in the Americas?esingmetal knives,which weren't produced by the native population livingA.Chopped wood.thethe time.The wooden pieces,left behind at the settement,came fromB.A snow storm.C.Metal knives.three different trees.Within those pieces were tree rings-including a clear marker for the yearD.The longships.英语第10页（共16页）信息卷英语第9页（共16页）信息卷
