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Nội dung: <blockquote data-quote="Butchi" data-source="post: 94587" data-attributes="member: 7">Scientists Clone Pigs to Make Omega-3 Fatty Acids Hướng dẫn: Nhấn nút play để nghe, đoán từ nghe được điền vào chỗ trống. Bôi đen chỗ trống xem đáp án.[MP3]https://server1.vnkienthuc.com/files/3/Media/se-ag-pigs-omega-3.mp3[/MP3]I'm Faith Lapidus with the VOA Special English AGRICULTURE REPORT.Scientists  say they have [A]developed[/A] pigs that produce omega-three fatty acids.   These fatty acids are believed to help fight [A]heart disease[/A].  But it  could be some time before these experimental pigs go to market.The  animals are clones, genetic copies of each other.  The Food and Drug  Administration has never [A]approved[/A] a cloned animal for use as food.   Still, some people believe Americans might someday buy the new pork if  they see it as heart-healthy.Professor Jing Kang at Harvard  Medical School took the first step in the work that led to the cloned  pigs.  His research[A] suggests[/A] that no mammal naturally produces  omega-three fatty acids.  So Doctor Kang genetically engineered mice  with a gene that can create them from another fatty acid.He took  the gene from a kind of small worm that[A] scientists[/A] have studied for  years.  Doctor Kang published his findings with two other researchers in  two thousand four.This research led the way for Randall Prather  at the University of Missouri to clone pigs that can do the same thing.   Pigs have been cloned before, but not for a purpose like this.  Last  month, Nature Biotechnology [A]published[/A] a report describing how the  experiment was done.  Seventeen scientists took part in the study.Fatty  acids are the building materials of fat.  Omega-three fatty acids are  believed to [A]reduce[/A] the risk of heart disease.  They are also thought to  reduce levels of harmful [A]cholesterol[/A] in the blood.The human body  can make most kinds of fat by itself out of [A]sugars[/A].  But it cannot make  omega-three or omega-six fatty acids.  These must come from foods or  dietary supplements.But it is still not clear how soon  genetically engineered animals might be [A]approved[/A] for Americans to eat.   Some people would have no concerns about eating meat produced through [A]biotechnology[/A].  Others, though, say they see the idea as a step too far  removed from nature.This new [A]research[/A] is aimed at producing pigs with a healthier form of fat.Fat  gives flavor.  But in the United States, pork producers have cut the  fat, hoping to appeal to people worried about heart disease.  Twenty  years ago the industry launched a [A]marketing campaign[/A] comparing pork to  chicken.  It called pork "the other white meat."Now the National  Pork Board has a new marketing campaign.  The aim is to get Americans to  think of pork as a way to add a little [A]excitement[/A] to dinner.  The  message: "Don't be blah."This VOA Special English AGRICULTURE REPORT was written by Mario Ritter.  I'm Faith Lapidus. </blockquote>

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