题目内容

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

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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

An optimist does not necessarily try ___________