单项选择题

A．They often take place in its major industries.
B．British trade unions are more powerful.
C．There arc more trade onion members in Britain.
D．Britain loses more working days through strikes every year.
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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.
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.
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