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

What is the best title for the text

A．How to Play Chess
B．Play Chess With Lens
C．Relationship Between Chess-playing and Lens-designing
D．What Insight From Lens to Chess