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
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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
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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