单项选择题

According to the passage, the author considers the reduction of energy in an empty region of space to which a real particle has been added to be ______.

A．a well-known process
B．a frequent occurrence
C．a fleeting existence
D．an unexpected outcome
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单项选择题
It can be inferred from the passage that scientists are currently making efforts to observe which of the following events
A．The decay of a vacuum in the presence of virtual particles.
B．The decay of a vacuum next to a super heavy atomic nucleus.
C．The creation of a super heavy atomic nucleus next to an intense electric field.
D．The creation of a virtual electron and a virtual positron as a result of fluctuations of a vacuum.
单项选择题
Which of the following titles best describes the passage as a whole
A．The Vacuum: Its Fluctuations and Decay.
B．The Vacuum: Its Creation and Instability.
C．The Vacuum: a State of Absence.
D．Particles that Materialize in the Vacuum.
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