单项选择题

It can be inferred from the passage that______.

A．scientists have discovered the working mechanism of the nose
B．humans detect odors with a large number of receptors responsive to the odorous molecules themselves
C．the receptors integrate various responses to the characteristics of an odor and store them in the brain
D．e-noses operate on principles totally different from those of a real nose

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单项选择题

Where might the passage be taken from

A．A novel.
B．A short play.
C．A play.
D．A book of facts.

单项选择题

What is the chief advantage of the virtual reality techniques when used in microsurgery

A．The medical students and surgeons can use it to practise simulated surgical operations as if operating on a real patient.
B．Medical students and surgeons can do any operations without considering their consequences.
C．It helps to do operations on human eyes extremely accurately.
D．It allows surgeons and their students to set their imagination free.