D.two different individuals leave two DNA samples.

　　3.To geneticists like Lewontin and Hartl, the current method ____.

　　A.is not so convincing as to exclude the likelihood that two DNA samples can never come from two individuals

　　B.is arguable because two individuals of the same ethnic group are likely to have the same DNA pattern.

　　C.Is not based on adequate scientific theory of genetics

　　D.Is theoretically contradictory to what they have been studying

　　4.The attitude of the Federal Bereau of Investigation shows that ____.

　　A.enough data are yet to be collected form various ethnic groups to confirm the unlikelihood of two DNA samples coming from two individual members

　　B.enough data of DNA samples should be collected to confirm that only DNA samples form the same person can match

　　C.enough data are yet to be collected from various ethnic groups to determine the likelihood of two different DNA samples coming form the same person

　　D.additional samples from various ethnic groups should be collected to determine that two DNA samples are unlikely to come from the same person

　　5.National Academy of Sciences holds the stance that ____.

　　A.DNA testing should be systematized

　　B.Only authorized laboratories can conduct DNA testing

　　C.The academy only is authorized to work out standards for testing

　　D.The academy has the right to accredit laboratories for DNA testing

　　第十四篇答案：CBABB