s*******1
发帖数: 135 | 1 On the basis of the available evidence, Antarctica has generally been
thought to have been covered by ice for at least the past 14 million years.
Recently, however, 3 million year old fossiles of a kind previously found
only in ocean-floor sediments were discovered under the ice sheet covering
central Antarctica. About 3 million years ago, therefore, the Antarctica's
mountains could have melted the ice sheet, thus raising sea levels and
submerging the continent.
Which one of the following is the | y*******y
发帖数: 71 | 2 B, right?
From the argument you cannot conclude that the general opinion has changed,
although the argument tends to say the opinion is wrong. | p**h
发帖数: 18 | 3 B is right, saying it is not continuous covered by ice, which imply the ice
once melted 3 m years ago.
A is not good, only melted for a short period is consistent with "generally"
thought to have been covered by ice.
.
for
【在 s*******1 的大作中提到】
: On the basis of the available evidence, Antarctica has generally been
: thought to have been covered by ice for at least the past 14 million years.
: Recently, however, 3 million year old fossiles of a kind previously found
: only in ocean-floor sediments were discovered under the ice sheet covering
: central Antarctica. About 3 million years ago, therefore, the Antarctica's
: mountains could have melted the ice sheet, thus raising sea levels and
: submerging the continent.
: Which one of the following is the
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