Theproblemofundergroundwaterismoreseriousbecause（）
[A]theundergroundwatertr icklesawayalltheyearround
[B]theundergroundwaterishiddendeepbeneaththeEarth
[C]thechangeofitmustbecontr olledbytheNASA'ssatellites
[D]thedramaticchangeofitmightaffectthegravitationalfield
正确答案：D![The problem of underground water is more serious because( )[A] the underground w](https://files.116s.com/2019-12/06/1575646834-3057.jpg "The problem of underground water is more serious because( )[A] the underground w")
