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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单项选择题
Marie felt nervous when she knocked at the door because ______.
A．it was her first day in a new job
B．she was a little bit late for work
C．she was afraid that she had gone to the wrong place
D．there was no answer from inside the office
单项选择题
Marie could hardly recognize the office she went into as ______.
A．she had been there only once
B．Mr. Smith was not in the office
C．nobody was doing any work
D．the office had a new appearance
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