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

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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