2016高考英语阅读理解集训。
阅读下列短文,从每题所给的四个选项(A、B、C、D)中,选出最佳选项。
Washington: NASA has announced evidence that Jupiter's largest moon, Ganymede, has a saltwater ocean under its icy surface. The ocean seems to have more water than all the water on Earth's surface, according to new Hubble observation.