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

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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.

单项选择题

In lens design,______.

A．it is completely impossible to preset the best steps along the way
B．it is always very hard to solve any problems
C．one can work out a best solution to problems in each step
D．there are countless steps towards the final goal