单项选择题

The passage focuses on ______.

A．dinosaur’s 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
Newly-found fossilized tracks in Alaska proved that dinosaurs' migration between Asia and North America took place ______.
A．much earlier than experts previously thought
B．much later than experts previously thought
C．after Asia became an independent continent
D．sometime around 25 million years ago
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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