单项选择题

AID will now concentrate on sustainable development programs in some fifty nations focusing on key areas not including ______.

A．environment
B．population
C．culture
D．economic growth
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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
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