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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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