题目选项分析

With surface temperatures estimated at minus 230 degrees Fahrenheit, Jupiter's moon Europa, long considered as far too cold to support life, and its 60 square miles of water thought to be frozen from top to bottom.

With surface temperatures estimated at minus 230 degrees Fahrenheit, Jupiter's moon Europa has long been considered far too cold to support life, its 60 square miles of water thought to be frozen from top to bottom.