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2015-01-01 10:03:00来源：网络

　　Paragraph 4: These ideas remain controversial. Proponents point to features such as the terraced "beaches" shown in one image, which could conceivably have been left behind as a lake or ocean evaporated and the shoreline receded. But detractors maintain that the terraces could also have been created by geological activity, perhaps related to the geologic forces that depressed the Northern Hemisphere far below the level of the south, in which case they have nothing whatever to do with Martian water. Furthermore, Mars Global Surveyor data released in 2003 seem to indicate that the Martian surface contains too few carbonate rock layers-layers containing compounds of carbon and oxygen-that should have been formed in abundance in an ancient ocean. Their absence supports the picture of a cold, dry Mars that never experienced the extended mild period required to form lakes and oceans. However, more recent data imply that at least some parts of the planet did in fact experience long periods in the past during which liquid water existed on the surface.

　　10. According to paragraph 4, what do the 2003 Global Surveyor data suggest about Mars?

　　Ancient oceans on Mars contained only small amounts of carbon.

　　The climate of Mars may not have been suitable for the formation of large bodies of water.

　　Liquid water may have existed on some parts of Mars' surface for long periods of time.

　　The ancient oceans that formed on Mars dried up during periods of cold, dry weather.

　　解析：根据关键词我们定位到文段的中间部分：Mars Global Surveyor data released in 2003 seem to indicate that the Martian surface contains too few carbonate rock layers-layers containing compounds of carbon and oxygen-that should have been formed in abundance in an ancient ocean.这道题可以当做事实信息题去做，但注意不是原文的简单重复，suggest 是原文中indicate的同义转换，我们只要找到what就好了，原文that后面是重点，出现了too few, should have,

　　情感态度推测一下，持否定态度，也就说说形成 an ancient ocean不太可能，我们看选项，A中说Ancient oceans on Mars contained only small amounts of carbon.主客体与原文矛盾，排除;B选项 The climate of Mars may not have been suitable for the formation of large bodies of water.说不适合形成大量的

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