The text mainly talks about The NDNAD has more DNA samples than other countries in that

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问题 The text mainly talks about
The NDNAD has more DNA samples than other countries in that

选项 A、it is holding profiles from more than 20% of all adults.
B、police are able to take samples from anyone arrested for a recordable offence.
C、Britain is the earliest to take DNA as an investigative tool.
D、other countries are not eager to do databasing.

答案C

解析 事实细节题。第四段第一句明确说明了NDNAD最大的原因,即英国最早使用DNA做调查工具,所以选项C正确;选项A中的数字是对未来的预测,而且不能作为原因;选项B是NDNAD刚刚建立时的规定,不是本题的原因;选项D在文中未提及。
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