問題詳情

With its short legs moving furiously, a tiny, flat-faced pug reminds one of a stuffed toy. In contrast, the wolf-like Siberian husky moves with the skill of an experienced wild hunter. Strangely, these two animals with completely different appearances belong to the same species, Canis familiaris, better known as dogs. Physical differences are causing scientists to rethink how they differentiate between species.Since an animal’s appearance is not always a clear indication of its species, scientists have begun using DNA to help with identification. The Barcode of Life project is aimed at researching a single gene that has a unique sequence in each species. Using that gene as a bar code, they will then be able to sort similar animals into groups. Animals with the same sequence would be part of the same species.This method will not only help identify current species, but also provide insight into species evolution. For example, through DNA research, scientists have discovered that domestic dogs are descended from wild gray wolves that were domesticated by humans long ago. The Barcode of Life project is definitely helping scientists gain a better understanding of the animal kingdom.
68.What is true of both the pug and the Siberian husky?
(A)They are animals of the same species.
(B)Theyhave similar appearances.
(C)Theyboth look like cute toys.
(D)Theyare very skilled hunters.

參考答案

答案：A
難度：非常困難0
統計：A(0),B(0),C(0),D(0),E(0)

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