The new system takes the combined urine of the crew from the toilet, moves it to a big tank, where the water is boiled off, and the vapor is collected. The rest of the urine is thrown away. Then the water vapor is mixed with water from air, and then it goes through filters(过滤器). When six crew members are aboard it can make about six gallons from urine in about six hours.

　　“Some people may find the idea of drinking recycled urine distasteful, but it is also done on earth, but with a lot longer time between urine and the tap，” said Marybeth Edeen, the space station's national lab manager.

　　The technology NASA developed for this system has already been used for quick water purification after the 2004 Asian tsunami.

　　67．According to the text, the recycling system is important because________.

　　A．it makes traveling to the moon for the average person possible

　　B．with it NASA won't need to ship any water up the space station

　　C．it can help meet the need for more water after the crew is expanded

　　D. it protects the environment in space by reducing the amount of waste

　　答案：C　细节理解题。根据第二段第二句中的“...it won't have to ship up as much water to the station by space shuttles or cargo rockets. Besides, it's important as the space station is about to expand from three people living on board to six.”可知选C。

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