A. water pushes on your body when you swim underwater.

　　B. the earth is surrounded by a layer of air called the atmosphere.

　　C. the pressure of air around us has a powerful force.

　　D. the air pressure is not equalized around us.C

　　C

　　Roger Federer and Serena Williams have been named as 2009' s world champions by the International Tennis Federation（ITF） after topping the year-end rankings．

　　Federer, who wins the honour for the fifth time, completed a career Grand Slam（at Roland Garros before winning his 15th Grand Slam ride at Wimbledon．

　　And Williams won the Australian Open and Wimbledon, her llth major success．

　　The pair will receive their awards at the annual 1TF world champions dinner in Paris in June．

　　Federer regained the world number one ranking from Rafael Nadal after his Paris victory and his Wimbledon win over Andy Roddick saw him surpass Pete Sampras' haul of Grand Slam titles．

　　He was also runner - up at the Australian Open and the US Open and helped his country retain its Davis Cup world group status．

　　" It is an honour for me to be named ITF world champion for a fifth time．It was an incredible （） year for me both on and off the court," said the 28 - year - old Swiss star whose wife Mirka gave birth to twin girls in July．

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