单项选择题

What was the danger Albert Einstein had warned Roosevelt about

A．The danger of Nazi Germany's advances in the development of the atomic bomb.
B．The possibility of atomic power from Nazi Germany.
C．Japan's unsatisfactory response to the Allies' Potsdam Declaration.
D．Destruction of everything from the explosion of the atomic bomb.
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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.
单项选择题
The so-called virtual reality'(Line 2, Para. 1) mentioned in the passage is actually______.
A．a Surgical tool used for operations
B．a computer system used to produce life-like illusions
C．a new kind of applications in a visual technology
D．a way to carry out operation in a visual sense
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