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单项选择题

A．specializedB．specialC．specialtyD．specialization……

A．specialized
B．special
C．specialty
D．specialization

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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The author's assertions concerning the conditions that lead to the decay of the vacuum would be most weakened if which of the following occurred

A．Scientists created an electric field next to a vacuum, but found that the electric field was not intense enough to create a charged vacuum.
B．Scientists assembled a super heavy atomic nucleus next to a vacuum, but found that no virtual particles were created in the vacuum's region of space.
C．Scientists assembled a super heavy atomic nucleus next to a vacuum, but found that they could not then detect any real particles in the vacuum's region of space.
D．Scientists introduced a virtual electron and a virtual positron into a vacuum's region of space, but found that vacuum did not then fluctuate.

问答题事实并非如此，因为这种问法是以人们对人的权利有共同认识为基础的，而这种共同认识并不存在。

问答题有些哲学家论证说，权利只存在于社会契约中，是责任与权益相交换的一部分。

问答题这种说法从一开始就将讨论引向两个极端，它使人们认为应这样对待动物：要么象对人类自身一样关切体谅，要么完全漠不关心。