单项选择题

"A buyer will get something for nothing" in Paragraph 2 most probably means that ______.

A．a buyer will not get what he pays for
B．a buyer will get more than what he pays for
C．a buyer will get something useful free of charge
D．a buyer will get more but pay less
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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
According to the passage, it was Dr. 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
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