［阅读］求逻辑大神：tpo8第三篇的两个问题

xmfairyUID: 3199393

Paragraph 2 Outflow channels are probably relics of catastrophic flooding on Mars long ago. They appear only in equatorial regions and generally do not form extensive interconnected networks. Instead, they are probably the paths taken by huge volumes of water draining from the southern highlands into the northern plains. The onrushing water arising from these flash floods likely also formed the odd teardrop-shaped “islands” (resembling the miniature versions seen in the wet sand of our beaches at low tide) that have been found on the plains close to the ends of the outflow channels. Judging from the width and depth of the channels, the flow rates must have been truly enormous―perhaps as much as a hundred times greater than the 105 tons per second carried by the great Amazon river. Flooding shaped the outflow channels approximately 3 billion years ago, about the same times as the northern volcanic plains formed.
5. In paragraph 2, why does the author include the information that 105 tons of water flow through the Amazon river per second?
○To emphasize the great size of the volume of water that seems to have flowed through Mars’ outflow channels
○To indicate data used by scientists to estimate how long ago Mars’ outflow channels were formed
○To argue that flash floods on Mars may have been powerful enough to cause tear-shaped “islands” to form
○To argue that the force of flood waters on Mars was powerful enough to shape the northern volcanic plains

6. According to paragraph 2, all of the following are true of the outflow channels on Mars EXCEPT:
○They formed at around the same time that volcanic activity was occurring on the northern plains.
○They are found only on certain parts of the Martian surface.
○They sometimes empty onto what appear to have once been the wet sands of tidal beaches.
○They are thought to have carried water northward from the equatorial regions.

问：
5.为什么flow rates=size of volume？明明是两个概念啊一个是速度一个是容量
6.AD也有问题啊，A说同时期火山活动，但原文是说同时期火山平原形成；D说from the equatorial regions.,但原文是说from the southern highlands.
感觉这两题都有偷换概念啊

咖啡盐UID: 2973669

5、这不是概念对等的问题，应该算是种侧面修饰；水是从南面的高地流向北面的平原，高地上的水越多，水流的压力也就越大，速度也就越快，就像黄河涨潮一样，潮水的水量越多，向下游流向的速度也就越快，Judging from the width and depth of the channels再加上这句话...B应该没有问题，之间没什么联系；C中island的形成只是因为水流的不断冲刷而成，和速度关系也不大；D中北部平原早就有了

6、A中，volcanic plain是由于火山喷发而形成的...你不会以为就是取个名字而已吧...
     D中，文章第二句They appear only in equatorial regions就已经说明了它的地理位置，from the southern highlands into the northern plains只是地貌而已，equatorial regions中同样可能南边是highland，北边是plain；而且文章也并没有说outflow只是在equatorial regions之内就结束吧，别人猜测它流出equatorial regions继续向北并没有错

xmfairyUID: 3199393

2# 咖啡盐 哦。明白了。谢谢～