LSAT-11-1-16

Question15-16

A favored theory to explain the dinosaurs, together with many other species, has been the globally catastrophic collision of a large asteroid with the Earth: Supporting evidence is an extraterrestrial chemical element in a layer of dust found worldwide at a geological level laid down contemporaneously with the supported event. A new competing theory contends that any asteroid impact was irrelevant, because it was massive volcanic activity that caused the extinctions by putting enough dust into the atmosphere to cool the planet. The Decean region of India contains extensive volcanic flows that occurred within the same time period as the supposed asteroid impact and the extinctions.

16. Which one of the following, if true, most of strongly indicates that the asteroid-impact theory is at least incomplete, if not false?

(A) Large concentrations of dinosaur nests with fossil eggs found in Alberta indicate that at least some species of dinosaurs congregated in large groups during some part of their lives.

(B) Dinosaur remains indicate that some species of dinosaur could have migrated in herds over wide ranges, so that they could have traveled to escape the local effects of certain catastrophes.

(C) Legends from many cultures, such as the Creex legend that Cudmus raised an army by sowing dragons’ teeth in the ground, show that various accident peoples worldwide were familiar with the fossils of dinosaurs.

(D) In the Gobi desert in China, where now only small animals can eke out an existence, fossil dinosaur skeletons 27 feet long were found in circumstances indicating that the climate there was as dry when the dinosaurs lived as it is now.

(E) The fossil record in Montano from below the layer of extraterrestrial dust shows a diminution over time in dinosaur species from 35 to 13, and dinosaur teeth found above the dust layer show a diminution in species from 13 to 5.

答案是E

答案我选对了，也明白。但看到以前的不同帖子中两个NN对B错误的原因的不同解释就不知道哪个更合理，如下：

M："could have" indicates that these species did not travel and did not escape the disaster. it therefore support the collision theory in that the catastrophy is global.

L：B错的原因是原文说globally catastrophic collision，所以跑得了初一，跑不了十五。

问题：1."could have migrated in" also indicates "did not migrate"吗？

2. 一个说没跑，一个说跑了，还是两个人说的一样都没跑？到底跑没跑？：（

谢谢了！

既然是GLOBALLY，全球性的，能跑到哪里去呢？

B这句话是对过去发生的事情的猜测, "could have migrated" dos not indicate "did not migrate". Actually it indicates that "it is very likely that they have migrated".

("i should have done something" indicates "i did not do it")