单项选择题

By "Dr. Clark lived for 112 days" ,the author most probably means that______.

A．the replacement of Dr. Clark' s heart was a failure
B．there was still a long way to go in applied bionics
C．applied bionics was promising
D．the first artificial heart was most effective
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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
The author's attitude towards applied bionics is______.
A．critical
B．approving
C．objective
D．questioning
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