炎德英才大联考·长沙市一中2024届高三月考试卷(三)2英语答案
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level rise covered more land.Once in the water,fish absorb mer
cury through their gills and their food.
To find out whether this problem was more widespread,ar-
chaeologist Hans Peter Blankholm of the Arctic University of
Norway and colleagues selected eight archaeological sites from
the shores of the Norwegian Arctic,an area known as Varanger.
The bones of seals and the cod at these sites contained 15-20
times the recommended levels of cadmium (and up to four
times the recommended levels of lead that are considered safe in
meat.The level of mercury was also high in both animals.
Blankholm calls these levels of heavy metals in seafood "un
healthy,if not unsafe".But he says it's unclear how much the
diet of these prehistoric people would have harmed them.Balan-
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