单选题
The Greeks who studied conic sections
A、
invented modem mathematical applications
B、
were interested in navigation
C、
were unaware of the value of their studies
D、
were forced to resign themselves to failure
【正确答案】
C
【答案解析】
第三段讲了Greeks从事conic sections研究，但当时他们只是狂热地追求知识，没有意识到数世纪后他们的知识能够应用于航海事业。
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