单项选择题

The final goal of designing a lens is______.

A．to trap the opponent's lenses
B．to focus light with lenses
C．to hand-make lenses at low cost
D．to reflect light by means of curved surfaces
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单项选择题
Which of the following words cannot be used to describe today's lensesA. More delicate.C. Numerous.B. Cheaper.D. Unpopular.
A．Cheaper.
B．Unpopular.
C．Numerous.
D．Which of the following words cannot be used to describe today's lenses
E．More delicate.
单项选择题
After the passage the author will talk about______.
A．the principles of designing lenses
B．techniques of making contact lenses
C．the design of photographic lenses
D．styles of lenses
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