单项选择题

Why does the man want to write about the ancient civilizations of Mexico

A．It would require a trip to Mexico.
B．It’s too broad a topic to research.
C．He doesn’t have relevant resource material.
D．He’s not interested in the part of the world.
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单项选择题
Why should the program be easy to understand
A．It is meant for nonscientists.
B．It is simple enough for children.
C．A discussion will be held after the show.
D．There will be a series following the first now.
单项选择题
A．abandonedB．changedC．standardizedD．reformed
A．abandoned
B．changed
C．standardized
D．reformed
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