单项选择题


A．decreased
B．increasingly
C．increased
D．compound
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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 aberration.
D．an unexpected outcome.
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 superheavy 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.
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