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
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
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