单项选择题

A lens designer in the past______.

A．did their work better
B．did not use glass for making lenses
C．was usually poor
D．designed the lens all by himself
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单项选择题
Compared with a chess player, lens designer______.
A．can put his design to mass production
B．can draw on various sources in his work
C．can reduce the cost of lens production
D．has no one to train him before taking up the work
单项选择题
In what way does lens design resemble chess
A．In the number of steps each takes towards the goal.
B．In the designs of the two activities.
C．The steps to the goals and the goal itself are known.
D．Each has a doer and a competitor.
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