LSAT-27-CR2-15

snow_mountain

15. The southern half of a certain region of the
earth was covered entirely by water during the
Cretaceous period, the last 75 million years of
the Mesozoic era, the era when dinosaurs roamed
the earth. Dinosaurs lived only on land. Thus,
Plesiosaurs---swimming reptile that lived during
the Cretaceous period exclusively---were not
dinosaurs. No single species of dinosaur lived
throughout the entire Mesozoic era.
If the statements in the passage are true, each
of the following could be true EXCEPT:
(A) Dinosaurs inhabited the northern half of the
region throughout the entire Mesozoic era.
(B) Plesiosaurs did not inhabit the southern half
of the region during the Cretaceous periods.
(C) Plesiosaurs did not inhabit the southern half
of the region before the Cretaceous period.
(D) Dinosaurs did not inhabit the northern half
of the region during the Cretaceous period.
(E) Dinosaurs inhabited the southern half of the
region throughout the entire Mesozoic era.


答案E。 为什么是E。上面说的

No single species of dinosaur lived
throughout the entire Mesozoic era.

只是表明没有一种恐龙在整个era都存在。并不一定排除一种恐龙消失了，另一种新的恐龙又出现。这样的话，E也是可能成立的呀。

ecsniffer

e是选项。
原文指出：
the Cretaceous period是the Mesozoic era的一部分，
during the Cretaceous period，the southern half of a certain region of the earth was covered entirely by water.而 Dinosaurs lived only on land.
所以e说在整个时期恐龙都生活在南部区域是不正确的

[此贴子已经被作者于2003-12-14 16:37:04编辑过]

snow_mountain

谢谢楼上的MM