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

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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

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.