The navigation computers have one thing in common
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The navigation computers have one thing in common:they all＿______.
A. contain series of maps on videodiscs or videotapes
B. contain 13,300 maps covering the continental US
C. can be obtained free of charge
D. cost a lot of money
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答案：A
本题是根据第四段中间这两句话出的问题“These computers vary in detail. But they all contain series of maps on videodiscs or videotapes.”所有（车载）计算机导航系统都含有电子地图，即保存在视盘或录像带上的地图（series of maps on videodiscs or videotapes)所以A为正确答案。