单项选择题

The author points out that the Greeks who studied conic sections ______.

A．invented modern mathematical applications
B．were interested in navigation
C．were unaware of the value of their studies
D．worked with electricity

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单项选择题According to the author, The common explanation (first sentence in third paragraph) of connections between economic, military, and cultural development is _______.

A．revolutionary and too new to have been applied to the history of the Byzantine Empire
B．reasonable, but an antiquated theory of the nature of progress
C．not applicable to the Byzantine revival as a whole, but does perhaps accurately describe limited periods during the revival
D．essentially not helpful, because military, economic, and cultural advances are part of a single phenomenon

单项选择题Which of the following does the author mention as crucial evidence concerning the manner in which the Byzantine revival began

A．The Byzantine military revival of the 860' s led to economic and cultural advances,
B．The Byzantine cultural revival lasted until 1453.
C．The Byzantine economic recovery began in the 900' s.
D．The revival of Byzantine learning began toward the end of the eighty century.