单项选择题

According to the passage, which may be the best title

A．Storing Used Nuclear Fuel
B．Dealing with Nuclear Waste
C．Renewable Nuclear Power
D．Environment and Resources
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单项选择题
In the author's discussion, which aspect is not mentioned
A．The technology for deep underground repositories.
B．A mixture of fuels to meet the electricity needs.
C．The long-term management of nuclear waste.
D．Reducing the resource use to its minimum level.
单项选择题
The phrase stumbling block may best refer to ______.
A．obstacle
B．motivation
C．acceleration
D．deceleration
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