单项选择题

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

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单项选择题

The most important advances made by man come from ______.

A．technical applications
B．apparently useless information
C．the natural sciences
D．the study of philosophy

单项选择题

The report of UNESCO tells us a reality that ______.

A．the development and the developing countries face a common problem
B．literacy is not a by-product of social and economic development
C．our view of literacy is very limited
D．illiterates constitute a large part of the world population