[求助] L27-4-15

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）

(E) Dinosaurs inhabited the southern half of the region throughout the entire Mesozoic era.

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Answer is E; Why D is not right?

原文说恐龙都生活在陆地； （D）说恐龙不生活在北半球，南半球都是水->恐龙生活在水里（不是不可能吗？）

explanation of host 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