单项选择题

The author's attitude towards applied bionics is______.

A．critical
B．approving
C．objective
D．questioning
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单项选择题
According to the passage, it was Dr. W. Lillehei that______.
A．first developed applied bionics
B．was the first to operate on the heart of a patient
C．developed the artificial heart
D．used more sophisticated methods to do "open heart" surgery
单项选择题
Which of the following does this passage mainly discuss
A．The application of bionics.
B．The first "open heart" surgery.
C．The development of the artificial heart.
D．The future of applied bionics.
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