单项选择题

The passage focuses on

A．dinosaurs' geographical location.
B．shifting views of dinosaurs.
C．migration patterns of dinosaurs.
D．geologic activity of Earth.
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单项选择题
Witmer's research leads people to believe
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.
单项选择题
The discovery of a new type of ceratopsian dinosaur suggests ceratopsians
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.
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