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The city of Peiping brings its residents into closer contact......

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The author points out that the Greeks who studied conic sections ______.
A．were mathematicians
B．were interested in navigation
C．were unaware of the value of their studies
D．worked with electricity
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Which of the following facts from the selection best supports the statement that the radioactive waste is an unsolved problem
A．We have already generated over 10,000 tons of nuclear waste.
B．Radioactivity could be released into the environmental from activities related to mining and processing nuclear fuel.
C．Only a part of nuclear fuel is fissionable.
D．A location for stainless steel tanks containing "high-level liquid waste" mixed with molten glass has not been foun
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