Laura Robson, right, and Andy Murray, of Great Britain, play a mixed doubles match against Lucie Hradecka and Radek Stepanek of the Czech Republic at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Thursday, Aug. 2, 2012. ? Photo by AP
Roger Federer, right, of Switzerland shakes hands after defeating John Isner of the United States at the All England Lawn Tennis Club in Wimbledon, London at the 2012 Summer Olympics, Thursday, Aug. 2, 2012. ? Photo by AP
Argentina's captain Luciana Aymar runs with the ball during a women's hockey preliminary round match against New Zealand, at the 2012 Summer Olympics, Thursday, Aug. 2, 2012, in London. ? Photo by AP
Deron Williams (8) of the United States shoots against Nigeria during a men's basketball preliminary round match at the 2012 Summer Olympics on Thursday, Aug. 2, 2012, in London. ? Photo by AP
Britain's Daniel Hunter, front, handles the ball as teammate Andrew Pink watches during a men's preliminary volleyball match against Italy at the 2012 Summer Olympics, Thursday, Aug. 2, 2012, in London. ? Photo by AP
Photograph of Jamaica's sprinter Usain Bolt is projected onto the Houses of Parliament during the 2012 Summer Olympics, Thursday, Aug. 2, 2012, in London. ? Photo by AP
Andreas Nilsson of Sweden, center, Alexander Petersson (15) and Asgeir Hallgrimsson (6) of Iceland challenge during their men's handball preliminary match at the 2012 Summer Olympics, Thursday, Aug. 2, 2012, in London. ? Photo by AP
United States' Rebecca Soni celebrates winning gold and setting a new world record in the women's 200-meter breaststroke swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Thursday, Aug. 2, 2012. Soni set a new world record with a time of 2:19.59. ? Photo by AP
South Africa's Chad le Clos men's competes in the men's100-meter butterfly swimming semifinal at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Thursday, Aug. 2, 2012. ? Photo by AP
Britain's Prince William, left, and Prince Harry talk while watching track cycling at the velodrome during the 2012 Summer Olympics, Thursday, Aug. 2, 2012, in London. ? Photo by AP
Italy's Valentina Vezzali (R) competes against Russia's Larisa Korobeynikova in the women's team foil fencing gold medal match at the ExCel arena during the London 2012 Olympic Games August 2, 2012. ? Photo by Reuters
Japanese gymnast Rie Tanaka performs on the vault during the artistic gymnastics women's individual all-around competition final at the 2012 Summer Olympics, Thursday, Aug. 2, 2012, in London. ? Photo by AP
Radek Stepanek, right, and Lucie Hradecka, of the Czech Republic, play a mixed doubles match against Laura Robson and Andy Murray of Great Britain at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Thursday, Aug. 2, 2012. ? Photo by AP
The government should withdraw from the wheat trade gradually, replacing the existing market support mechanism with an effective new one over the next several years.
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