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.

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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.

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.