tpo8 閱讀 running water on Mars - 英檢

第二段
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.



題目
According to paragraph 2, all of the following are true of the outflow
channels on Mars EXCEPT:

A.
They formed at around the same time that volcanic activity was occurring on
the northern plains.
B.
They are found only on certain parts of the Martian surface.
C.
They sometimes empty onto what appear to have once been the wet sands of
tidal beaches.
D.
They are thought to have carried water northward from the equatorial
regions.


答案是C 我選B

但其實B也是錯的吧?

詳解寫說certain parts與 equatorial regions 意思重合

但上下文意看不出來啊




另外

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.

題目
Look at the four squares [] that indicate where the following sentence could
be added to the passage. Where would the sentence best fit?

These landscape features differ from runoff channels in a number of ways.

答案是A

祥解是寫說 a number of ways是提綱性句子，所以要置前
然後landscape features對應到relics of catastrophic

可以問何謂提綱性句子嗎?

該如何分辨? 有點看不懂

感謝!


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