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听力原文： The FBI warned a planned terror attack may occur in the United States or against U．S．interests in Yemen，as reported on Tuesday， but U．S． officials do not know the target or how the suspected plot would be carried out． The FBI said the uncorroborated threat came from information discovered in Afghanistan，where the U．S．military has been sifting through material left by al Qaeda members，and from interviews with detainees，including al Qaeda members，held at the U．S．Navy Base at Guantanamo Bay，Cuba．Rushing to put out the alert late Monday night after recently discovering the possible threat， the FBI said one or more operatives might be involved in the attack，including a Saudi-born Yemeni man．
The FBI sounded a warning against a possible attack in the United States because ______
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听力原文： Several hundred people have joined a protest near U. S. President George W. Bush's holiday ranch in Texas to demonstrate against the war in Iraq. The two-week-old protest-organized by Cindy Sheehan, whose son was killed in Iraq last year, is being held to call for the withdrawal of the 138,000 U. S. troops deployed there. Cindy Sheehan's 24-year-old son was killed in Baghdad on April 4, 2004, who is among the 1,829 American troops, including 31 this month, who have died in Iraq since the U. S. -led invasion in March 2003. The president--who is spending a nearly five-week-long working vacation at his Texas ranch--said in a speech Wednesday that the sacrifices of U. S. troops were "made in a noble cause. "Bush, who said he sympathizes with Sheehan, has made no indication that he will meet with her.
What is the passage mainly about？
How many hours do the researchers advise people to spend doing weekly physical exercises？
听力原文： In his radio address on Saturday, Bush warned that there is likely to be more tough fighting to come in Iraq. The president urged Americans to share their confidence in a positive outcome to the war. And he told radio listeners his aim is to defeat members of Saddam Hussein's former regime and foreign and Iraqi terrorists and criminals responsible for the violence. At the same time, the United States is helping train Iraqi security forces so U. S. troops can eventually return home. Bush again turned aside calls in Congress and elsewhere for him to set a deadline for withdrawing U.S. troops.
It seems that ______
What is U.S. President Bush doing when the protest is on？
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