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

What importance do the voluntary non-governmental organizations have in literacy pro grams

A．They demonstrate how literary changes society.
B．They show that literacy is often imposed on people.
C．They provide conditions in which people can become literate.
D．They enable people to take part in international literacy schemes.