[求助] TPO8 3阅读 Running water on Mars的两个问题 [复制链接]

ailin1232
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发表于 2013-2-20 13:18:14 |只看该作者 |倒序浏览

本帖最后由 ailin1232 于 2013-2-20 13:19 编辑

Paragraph 1: Photographic evidence suggests that liquid water once existed in great quantity on the surface of Mars. Two types of flow features are seen: runoff channels and outflow channels. Runoff channels are found in the southern highlands. These flow features are extensive systems―sometimes hundreds of kilometers in total length―of interconnecting, twisting channels that seem to merge into larger, wider channels. They bear a strong resemblance to river systems on Earth, and geologists think that they are dried-up beds of long-gone rivers that once carried rainfall on Mars from the mountains down into the valleys. Runoff channels on Mars speak of a time 4 billion years ago (the age of the Martian highlands), when the

2. What does the discussion in paragraph 1 of runoff channels in thesouthern highlands suggest about Mars?
○The atmosphere of Mars was once thinner than it is today.
○Large amounts of rain once fell on parts of Mars.
○The river systems of Mars were once more extensive than Earth’s.
○The rivers of Mars began to dry up about 4 billion years ago.

选项A怎么不对？

9.“But detractors maintain that the terraces could also havebeen 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.”
这句话的句意转换：
○But detractors argue that geological activity may be responsible for the water associated with the terraces.
○But detractors argue that the terraces may have been formed by geological activity rather than by the presence of water.
○But detractors argue that the terraces may be related to geological forces in the Northern Hemisphere of Mars, rather than to Martian water in the south.
○But detractors argue that geological forces depressed the Northern Hemisphere so far below the level of the south that the terraces could not have been formed by water.
为什么不是D而是B