In the Olympic history before， no city has hosted both the winter and summer games． Now， Beijing will be the （71）f______ city of doing it．
After hosting the Summer Olympics in 2008， China will （72）h______the 2022Winter Olympics． On July 31， 2015， China （73）b______ Kazakh rival（对手） Almaty 44-40in a surprising close vote（选票）．
In 2008， Beijing （74）c______ many factories to short pollution， and the （75）c______of hosting the Summer Olympics was 44billion．Duringthe2022WinterGames，（76）______，BeijinghopestoshowagreenerChina，withonly3.1billion．
Beijing plans to use several playgrounds from the 2008Olympics， （77）i______ the Bird"s Nest and Water Cube． But the snow and sliding events would be in Yangqing and Zhangjiakou， 60and 140kilometers （78）a______ from Beijing．
The IOC regarded（把……视为） Beijing as a （79）s______， reliable（可靠的） choice because it offered great commercial（商业的） opportunities in a new winter sports market．
"It really （80）i______ a safe choice，" IOC President Thomas Bach said． "We know China will keep its promises．"

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