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
Lens designers today______.
A．have a large source of help to fall back on
B．receive a low salary
C．are less respectable than those of the past
D．are not decisive in the lens design
单项选择题
Which of the following words cannot be used to describe today's lenses
A．More delicate.
B．Numerous.
C．Cheaper.
D．Unpopular.
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