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Once found almost entirely in the western United States and in Asia, dinosaur fossils are now being discovered on all seven continents. A host of new revelations emerged in 1998 that promise to reshape scientists’ views of dinosaurs, including what they looked like and when and where they lived.
It is doubtful that Tyrannosaurus Rex had lips or that Triceratops had cheeks, says Lawrence Witmer, an assistant professor of anatomy at Ohio University in Athens, Ohio. Witmer was a leading researcher for a study on dinosaur anatomy that was presented at the annual meeting of the Society for Vertebrate Paleontology, which concluded on October 3 in Snowbird, Utah.
Witmer’s study reached its conclusions by using high-tech computerized axial to mograply (CT or CAT) scans along with comparative anatomy studies. For example, the theory that Triecratops and similar dinosaur species had cheeks was based on past compa
A. Tyrannosaurus Rex had lips and Triceratops had cheeks
B. dinosaurs might have looked like mammals such as sheep
C. dinosaurs might not have looked like what we thought
D. dinosaurs must have looked like birds or crocodiles

[单项选择]
Once found almost entirely in the western United States and in Asia, dinosaur fossils are now being discovered on all seven continents. A host of new revelations emerged in 1998 that promise to reshape scientists’ views of dinosaurs, including what they looked like and when and where they lived.
It is doubtful that Tyrannosaurus Rex had lips or that Triceratops had cheeks, says Lawrence Witmer, an assistant professor of anatomy at Ohio University in Athens, Ohio. Witmer was a leading researcher for a study on dinosaur anatomy that was presented at the annual meeting of the Society for Vertebrate Paleontology, which concluded on October 3 in Snowbird, Utah.
Witmer’s study reached its conclusions by using high-tech computerized axial to mograply (CT or CAT) scans along with comparative anatomy studies. For example, the theory that Triecratops and similar dinosaur species had cheeks was based on past compa
A. migrated to North America around 70--80 million years ago
B. arrived in Asia from North America about 90 million years ago
C. originated in Asia and later migrated to North America
D. could have moved to Asia from North America long ago

[单项选择]
Once found almost entirely in the western United States and in Asia, dinosaur fossils are now being discovered on all seven continents. A host of new revelations emerged in 1998 that promixse to reshape scientists’views of dinosaurs, including what they looked like and when and where they lived.
It is doubtful that Tyrannosaurus Re had lips or that Triceratops had cheeks, says Lawrence Witmer, an assistant professor of anatomy at Ohio University in Athens, Ohio. Witmer was a leading researcher for a study on dinosaur anatomy that was presented at the annual meeting of the Society for Vertebrate Paleontology, which concluded on October 3 in Snowbird, Utah.
Witmer’s study reached its conclusions by using high - tech computerized aial tomography (CT or CAT) scans along with comparative anatomy studies. For eample, the theory that Triceratops and similar dinosaur species had cheeks was based on past compari
A. Tyrannosaurus Re had lips and Triceratops had cheeks.
B. dinosaurs might have looked like mammals such as sheep.
C. dinosaurs might not bare looked like what we thought.
D. dinosaurs must have looked like birds or crocodiles.

[单项选择]

Once found almost entirely in the western United States and in As. ia, dinosaur fossils are now being discovered on all seven continents. A host of new revelations emerged in 1998 that promise to reshape scientists’ views of dinosaurs, including what they looked like and when and where they lived.
It is doubtful that Tyrannosaurus Rex had lips or that Triceratops had cheeks, says Lawrence Witmer, an assistant professor of anatomy at Ohio University in Athens, Ohio. Witmer was a leading researcher for a study on dinosaur anatomy that was presented at the annual meeting of the Society for Vertebrate Paleontology, which concluded on October 3 in Snowbird, Utah.
Witmer’s study reached its conclusions by using high-tech computerized axial tomography (CT or CAT) scans along with comparative anatomy studies. For example, the theory that Triceratops and similar dinosaur species had cheeks was based on past comparisons with mammals such as sheep. But Witmer&rsq
A. Tyrannosaurus Rex had lips and Triceratops had cheeks.
B. dinosaurs might have looked like mammals such as sheep.
C. dinosaurs might not have looked like what we thought.
D. dinosaurs must have looked like birds or crocodiles.