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
The control of artificial devices is improving because______.
A．video signals can be transformed into light patterns
B．bionic machines have existed for centuries
C．artificial devices such as arms, legs and eyes require better control than bionic machines
D．science has made great advances in electronics
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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