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听力原文：W: Can you tell me how long a formal visit lasts in the U.S.A？
M: It depends. Usually half an hour. It can last a bit longer if tea or coffee is brought, but never longer than an hour. Remember in no circumstances should you get your host tired of seeing you again.
Q: In most circumstances, how long does a visit last？
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听力原文：M: These steel chairs are on sale for $ 85 each or $ 150 for a pair. How many would you like to have？
W: Let me have a look. Oh, good! I think I'd like to have two.
How much will the woman pay for the chairs？
取得资产管理业务资格的证券公司，才可以办理定向资产管理业务。()
大亚湾地理位置得天独厚，地处2l世纪亚太经济圈的核心位置。近年来，它以集港口工业、国际贸易、旅游为一体的未来百万人口海滨一流新城市的宏伟蓝图，吸引着众多的海内外客商。举世瞩目的熊猫汽车城、东风汽车城、南海石化城、庄士工业城等一批超大型工业和旅游项目，都先后落户在这里。这段话的中心意思是()。
根据UCP600规定，不可撤销信证既不得修改，也不得撤销，开证行承担必须付款之责。
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