题目内容

Some people believe that using a DNA fingerprint may not be so reliable because___________

A. the accuracy of DNA fingerprinting has been challenged
B. no private laboratory follows uniform. testing standards or quality controls
C. mistakes are possible when researchers explain the results of their tests
D. suspects may not have enough money to provide their own DNA to law-courts

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When your brother looks exactly like you, your complete DNA may be___________

A. exactly like his
B. totally different from his
C. unique
D. lost

Some scholars did not believe___________

Dr. David Faxon believed that the implantable, permanent artificial heart will certainly

A. Right
B. Wrong
C. Not mentioned

There is no difference in structure between the self-contained heart and the mechanical heart.

A. Right
B. Wrong
C. Not mentioned