单项选择题

A．They read poetry aloud.
B．They delivered a speech.
C．They took objective tests.
D．They exchanged opinions with some people in a particular field.
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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
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
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