单项选择题

Why knights fought bravely to win kingdoms rich with diamonds

A．Diamonds are very valuable.
B．They want to become the richest man.
C．They think it is more important to discover diamonds than to discover new lands.
D．They are eager for jeweled crowns.
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A． classic disasterB. great achievementC. common people’s livesD. political news
A． classic disasterB. great achievementC. common people’s livesD. political news
单项选择题
The author uses the example of the early models of high-speed railroad cars primarily to ______.
A．support the thesis that the number of errors in modern engineering systems is likely to increase
B．illustrate the idea that courses in design are the most effective means for reducing the cost of designing engineering systems
C．support the contention that a lack of attention to the nonscientific aspects of design results in poor conceptualization by engineers
D．weaken the proposition that mathematics is a necessary part of the study of design
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