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1、听力文本The challengers for the US presidency have been addressing large rallies as they try tomaximize their support on Super Tuesday. Eleven US states are choosing Democratic andRepublican Party candidates for Novembers election.The Republican Donald Trump and theDemocrat Hillary Clinton are hoping wi
2、ns today will allow them to pull decisively away from theirrivals. James Cook reports. Polls suggest Donald Trump will sweep the board in almost all of the11 states which are in play despite the hostility of many people inside his adopted party.Having built his support on divisive rhetoric about ban
3、ning Muslims from entering the US andbuilding a wall on the Mexican border, Mr. Trump today tries to present himself as the unitycandidate. The exception to Mr. Trumps expected dominance may be here in Texas, thehome of Senator Ted Cruz who insists he is the only credible conservative alternative to
4、 theproperty tycoon, a claim disputed by another Senator Marco Rubio of Florida. Mrs.Clintonsonly rival for the Democrats nomination Bernie Sanders will be hoping to win in his home stateof Vermont.NATOs most senior commander in Europe has accused Russia of helping the Syriangovernment to create a r
5、efugee crisis deliberately as a weapon of war. General PhilippeBreedlove told a Senate Committee in Washington that he could see no reason for Moscow andDamascus to use indiscriminate weapons against civilians in Syria other than to displacepeople. The Russians are using almost no precision weaponry
6、. Their weaponry is impreciseand dropped in a large quantity and again I dont know what military utility that would haveother than to get people displaced and on the road and into someone elses problems there.The Head of FBI has accepted that forcing Apple to unlock an iPhone linked toa terror attac
7、kcould set a legal precedent. James Comey told a congressional committee that Apples iPhoneencryption stopped law enforcement agencies from gathering evidence. Apple says creatingsoftware to unlock the phones would weaken the security of hundreds of millions of devices.Police in Brazil have arrested
8、 the Vice President of Facebook Latin America, saying the socialmedia company has refused to cooperate in a drugs trafficking investigation. The authoritieshave been seeking information from the companys phone messaging service Whats App. JuliaCarneiro reports. Diego Dzodan was detained at his home
9、in Sao Paolo accused of violating aBrazilian law on organized crime by failing to hand over data from Whats App. If hesconvicted of preventing or hampering investigations involving criminal organizations, he couldface between three and eight years in prison. In a statement, Facebook described the de
10、tentionas extreme and disproportionate. Youre listening to the latest world news from the BBC.The Bolivian President Evo Morales has begun legal action against former girlfriend demandinghis son he thought to have died nine years ago. The woman Gabriel Zapata has told Mr. Moralesthe boy died in infa
11、ncy. But one of her relatives now says the child is alive and lives in anundisclosed location in Bolivia. Mr. Morales says Ms. Zapata has been given five days topresent the boy to the authorities.Officials in Jordan say the security forces have killed several militants during raids to arrestsuspecte
12、d Islamists in the northern city of Irbid near the border with Syria. The governmentdescribed it as one of the largest sweeps against hardline Islamist groups in recent years.Scientists say theyve identified for the first time a gene responsible for grey hair. Theresearchers say the gene called IRF4
13、 is involved in regulating melanin the pigment being haircolor as well as the color of the skin and eyes. One of the scientists Dr Kaustubh Adhikari fromUniversity College London says further research could make it possible to target proteinsresponsible for greying. We think that eventually you coul
14、d have a bill or you could have alotion for your skull about something that you might use for this purpose. Thats allspeculative in the future. We have to do much more study before we can do that.Police in the Philippines say a gunman has shot and wounded an influential Saudi Arabianpreacher who had
15、 just left a university lecture. Sheikh Aaidhal-Qarni was attacked in thesouthern city of Zamboanga by a man who ran out of the crowd. The police shot the attackerdead. Sheikh al-Qarnis injuries are not life threatening.Top American baseball team The Tampa Bay Rays will play an exhibition match agai
16、nst theCuban National Team in Havana during President Obamas historic visit in three weeks time. Therace will become the first Major League side play in Cuba since 1999. BBC News.词汇学习1.melanin n.黑色素例句：Freckles are simply concentrations of melanin.雀斑不过是高浓度的黑色素。2.pigment n.色素 例句：The Romans used natural pigments on their fabrics and walls.古罗马人在织物和墙壁上使用天然颜料。3.infancy n.婴儿期，初创阶段例句：Computing science was still in its infancy.计算科学仍然处于初期阶段。4.indiscriminate adj.不加区别的例句：The i
