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第104期：主餐一道：泛听练习
以下段落是摘自新闻里的一些重要信息,并不是一个段落的听写。空内信息可在本新闻中全部找到,大家可以根据这些信息复述新闻。
一、泛听建议：
1、完整听一遍，掌握大意。
2、继续听，特别注意关键信息。遇到相似的词，写下来。
3、复述新闻。
Law enforcement officials are reporting progress in the investigation of the Boston Marathon _1_ that killed at least 3 people and _2_ more than 170. Video of the bombing scene has been key and the possible suspect has been spotted. However, NPR's Tom Gjelten says the FBI is saying that no arrests have yet been made in the case.
执法官员报告了波士顿马拉松赛爆炸案的调查进展，这起爆炸案造成至少3人死亡，170余人受伤。爆炸现场的录像成为关键线索，警方已锁定了嫌疑人。但是，据NPR新闻的汤姆·吉杰尔登报道，联邦调查局表示目前并没有逮捕任何案件相关人员。
A senior law enforcement official tells NPR that video of the spot warns at least one of the bombs _3_, shows a man setting down a bag and then leaving the scene. But the official says that there is not necessary mean that the man is the suspect. We need more than that, the official says.Early press reports say a man _4_ and was even been taken to the federal court house in Boston, but the FBI is knocking no reports down on hard.In the statement, the FBI said "contrast to widespread reporting, no arrests have been made in connection with the Boston Marathon attack."Over the past days there have been a number of press reports based on information from unofficial sources that have been inaccurate, the bureau said. Tom Gjelten, NPR News, Washington.
一名高级执法官员接受NPR新闻的采访时表示，案发现场的监控录像表明，至少一枚炸弹爆炸前，一名男子放下一个背包之后离开案发现场。但是官员表示，并不是说这名男子就是嫌疑犯。官员表示，我们需要更多线索。早前有媒体报道，一名男子已被逮捕，并已被送往波士顿联邦法庭，但是联邦调查局否认了这一说法。联邦调查局发表声明表示，“与大量报道相反，目前并没有逮捕任何波士顿马拉松赛袭击案的相关人员。”联邦调查局表示，过去这几天，大量媒体依据非官方信息源进行的报道均不属实。NPR新闻，汤姆·吉杰尔登华盛顿报道。
The FBI is leading an investigation to poison letters that were sent to political leaders. NPR's Ari Shapiro reports one was addressed to president Obama, and another to Mississippi senator, Roger Wicker.
联邦调查局正在调查寄给政界领导人的有毒信件。据NPR新闻的阿里·夏皮罗报道，其中一封寄给了奥巴马总统，另一封则寄给了密西西比州参议员罗杰·威克。
Both of the letters were intercepted before they _5_ their targets. White House spokesman Jay Carney says the FBI is conducting further tests to confirm the initial readings that the letters contained the poison ricin.
这两封信都在送达之前被截获。白宫发言人杰伊·卡尼表示，联邦调查局正在进行进一步的检测，初步检测结果表明信件中含有蓖麻毒素。
"I would underscore that the mail is screened , the mail sent here screened and these tests undertaken at remote sites to mitigate the risk both to those recipients and to the general population."
“我要强调这封邮件的筛查工作，寄到这里的邮件的筛查工作，检测工作都在远程站点进行，以降低对收件人和普通大众的风险。”
词汇解析：
1. screen 文中用作动词；表示筛选；检查，筛查；进行安全检查
eg. They will screen all their candidates.
他们会对所有求职者进行筛选。
eg. The airline had been screening baggage on X-ray machines.
该航空公司已采用X光机对行李进行安全检查。
2. back down 放弃（主张、要求、承诺等）；打退堂鼓
eg. The United States had no intention of backing down in its bitter row over farm subsidies.
美国无意就激烈争吵的农产品补贴问题作出让步。
It's too late to back down now.
现在打退堂鼓已经太晚了。
He had to back down on plans to backdate the tax changes.
他不得不放弃追溯税收调整的计划。
3、underscore vt. 强调；划线于…下(同近义词emphasize, stress, highlight）
n. 底线，[计] 下划线（bobbin thread, bottom-line）
eg:I want to underscore the importance of this decision.
我要强调这份决议的重要性。
4. contain 文中用到了contain不常用的用法，vt.控制；遏制；防止…蔓延
eg. More than a hundred firemen are still trying to contain the fire at the plant...
上百名消防队员仍在试图控制工厂的火势。
eg:The city authorities said the curfew had contained the violence.
市政府称宵禁遏制住了暴力事件。
eg. He couldn't contain himself for joy.
他高兴得几乎不能控制住自己。
