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  3. Got milk? If you do, take a moment to ponder the true oddness of being able to drink milk after you’re a baby. No other speci

Got milk? If you do, take a moment to ponder the true oddness of being able to drink milk after you’re a baby. No other speci

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问题    Got milk? If you do, take a moment to ponder the true oddness of being able to drink milk after you’re a baby.
   No other species but humans can. And most humans can’t either.
   The long lists of food allergies some people claim to have can make it seem as if they’re just finicky eaters trying to rationalize likes and dislikes. Not so. Eggs, peanuts, tree nuts, fish, shellfish soy and gluten all can wreak havoc on the immune system of allergic individuals, even causing a deadly reaction called anaphylaxis.
   But those allergic reactions are relatively rare, affecting an estimated 4% of adults.
   Milk’s different.
   There are people who have true milk allergies that can cause deadly reactions. But most people who have bad reactions to milk aren’t actually allergic to it, in that it’s not their immune system that’s responding to the milk. Instead, people who are lactose intolerant can’t digest the main sugar-lactose-found in milk. In normal humans, the enzyme that does so-lactase-stops being produced when the person is between two and five years old. The undigested sugars end up in the colon, where they begin to ferment, producing gas that can cause cramping, bloating, nausea, flatulence and diarrhea.
   If you’re American or European it’s hard to realize this, but being able to digest milk as an adult is one weird genetic adaptation.
   It’s not normal. Somewhat less than 40% of people in the world retain the ability to digest lactose after childhood. The numbers are often given as close to 0% of Native Americans, 5% of Asians, 25% of African and Caribbean peoples, 50% of Mediterranean peoples and 90% of northern Europeans. Sweden has one of the world’s highest percentages of lactase tolerant people.
   Being able to digest milk is so strange that scientists say we shouldn’t really call lactose intolerance a disease, because that presumes it’s abnormal, instead, they call it lactase persistence, indicating what’s really weird is the ability to continue to drink milk.
   There’s been a lot of research over the past decade looking at the genetic mutation that allows this subset of humanity to stay milk drinkers into adulthood.
   A long-held theory was that the mutation showed up first in Northern Europe, where people got less vitamin D from the sun and therefore did better if they could also get the crucial hormone (it’s not really a vitamin at all) from milk.
   But now a group at University College London has shown that the mutation actually appeared about 7, 500 years ago in dairy farmers who lived in a region between the central Balkans and central Europe, in what was known as the Funnel Beaker culture.
   The paper was published this week in PLOS Computational Biology.
   The researchers used a computer to model the spread of lactase persistence, dairy farming, other food gathering practices and genes in Europe.
   Today, the highest proportion of people with lactase persistence live in Northwest Europe, especially the Netherlands, Ireland and Scandinavia.  But the computer model suggests that dairy farmers carrying this gene variant probably originated in central Europe and then spread more widely and rapidly than non-dairying groups.
   Author Mark Thomas of University College London’s dept of Genetics, Evolution and Environment says, "In Europe, a single genetic change.., is strongly associated with lactase persistence and appears to have people with it a big survival advantage. "
   The European mutation is different from several lactase persistence genes associated with small populations of African peoples who historically have been cattle herders.
   Researchers at the University of Mary land identified one such mutation among Nilo-Saharan-speaking peoples in Kenya and Tanzania. That mutation seems to have arisen between 2,700 to 6, 800 years ago. Two other mutations have been found among the Beja people of northeastern Sudan and tribes of the same language family in northern Kenya.
According to Mark Thomas, we can infer that ______.
选项 A、in Europe, people with longevity must not be lactase persistence.
B、a genetic mutation on lactase persistence changed people’s life.
C、the European people benefit from genetic change.
D、the Europeans have superior survival advantage to other human races.
答案C
解析 “In Europe，a single genetic change…with it a big survival advantage.”意思是“在欧洲，单一的基因改变与乳糖耐受性联系密切，而且使人们拥有更大的生存优势。”A项太绝对，B项不符合原文意思。D项以偏概全，文中并没有说欧洲人比其他所有人种都具有生存优势。
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