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Ceratopsia

Ceratopsia thrived in North America and Asia during the Cretaceous Period (about 146 to 65.5 million years ago). Their name means "horned face" and indeed many of them did feature bony horns projecting from their skulls. ■
(A) The horns may look quite predatory, but Ceratopsians were herbivores¹, so their horns were defensive in nature and may have been used to enforce order in the group. ■
(B) Not all Ceratopsians had horns, but all had beaklike mouths. ■
(C) The fossil record has revealed three distinct families among Ceratopsia: Psittacosaurids, Protoceratopsids, and Ceratopsids. Triceratops, a member of the Ceratopsid family, is probably the best known species of Ceratopsia. With its facial horns and neck display, it exhibits many of the features commonly associated with this dinosaur group. ■
(D) However, there are species of Ceratopsia that are quite different from the fami
A. Not all Ceratopsian species had horns.
B. Ceratopsians were vegetarians.
C. The behavior of similar species indicates other purposes.
D. Other physical features were better adapted for huntin

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Ceratopsia

Ceratopsia thrived in North America and Asia during the Cretaceous Period (about 146 to 65.5 million years ago). Their name means "horned face" and indeed many of them did feature bony horns projecting from their skulls. ■

(A) The horns may look quite predatory, but Ceratopsians were herbivores¹, so their horns were defensive in nature and may have been used to enforce order in the group. ■
(B) Not all Ceratopsians had horns, but all had beaklike mouths. ■
(C) The fossil record has revealed three distinct families among Ceratopsia: Psittacosaurids, Protoceratopsids, and Ceratopsids. Triceratops, a member of the Ceratopsid family, is probably the best known species of Ceratopsia. With its facial horns and neck display, it exhibits many of the features commonly associated with this dinosaur group. ■
(D) However, there are species of Ceratopsia that are quite different from the fami
A. include.
B. belong in.
C. result from.
D. assimilat

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[填空题]Peoples occupied North America before the arrival of the (1)______
European in the 15th century have long been known as Indians because (2)______
of the belief prevalent at time of Columbus that the Americas were the (3)______
outer reaches of the Indies. Most scholars agree that Native Americans
came into the Western Hemisphere from Asia by the Bering Strait in a (4)______
series of migrations. From Alaska they spread to the east and south. (5)______
Several separate waves of migration are said to count for the many native (6)______
linguistic families, while the common origin used to explain the physical (7)______
characteristics that Native Americans have in common--Mongoloid
features, coarse, straight, black hair, dark eyes, sparse body hair, and
a skin colour range from yellow-brown to reddish brown. Many scholars (8)______

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