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.
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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.
单项选择题
Martin Goldsmith believes that computer music has not yet been widely accepted because
A．the technology prevents composers from contacting their listeners.
B．no great music has yet been created through computer technology.
C．famous composers refuse to use the new technology to make music.
D．computer is not a terrific instrument for making musical works.
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