The discovery of subsurface life on Earth, surviving independently from surf

游客2024-01-10 22

问题 The discovery of subsurface life on Earth, surviving independently from surface life, refuted the belief that biological processes require not only liquid water but sunlight as well, thus greatly enhancing the possibility of life beyond Earth. Take Jupiter’s moon Europa. Space probes show a body covered with a thick layer of ice. As Europa orbits its planet, however, it flexes due to the gravitational tug-of-war between it, its sister moons, and Jupiter. Through friction, this flexing produces heat in the moon’s interior capable of melting ice. Photosynthetic life is impossible there because sunlight is completely absent, but life such as the microbes that flourish deep within earth may still be possible. [br] Life on Europa in the form suggested in the passage would be dependent on

选项 A、the protection Europa’s icy crust gives against the harmful components of sunlight
B、the existence of water on Europa
C、the motion of Europa around Jupiter

答案 B,C

解析根据本文，在木卫二上要想形成生命，其流程是：围绕木星转→扭曲→摩擦→产生热量→融化冰→水→生命，因此选项B、C正确。很多考生认为选项C不对，因为根据上面的流程， “围绕木星转”这个条件离形成生命“太远了”。注意，题干中的depend on是逻辑题中假设题的题型关键词，A depend on B等于是在说“A是B的前提”，根据逻辑题关于“假设”的定义，得出结论之前的内容都是假设，所以只要是在上面流程中的因素，都是木卫二上形成生命所依赖的条件。A项文中未提及。

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