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
The people in the office suddenly started working because______.
A．they saw a stranger in the office
B．their morning break was ended
C．no one wanted to talk to Marie
D．the boss was about to arrive
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