阅读理解
阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项。
A
Astronauts aboard the space station Celebrated a space first on Wednesday by drinking water that had been recycled from their urine and sweat and water that condenses from exhaled air. They said “cheers” ，clicked drinking bags and toasted NASA workers on the ground who were sipping their own version of recycled drinking water.
The recycling system is needed for astronaut stations on the moon and Mars. It also will save NASA money because it won’ t have to ship up as much water to the station by space shuttle or cargo rockets.Besides, it’ s important as the space station is about to expand from three people living on board to six.
