On the basis of a rereading of the texts of Jane Austens novels, a literary critic suggests that, contrary to accepted literary interpretations. Austens plots were actually metaphors for political events in early nineteenth-century England.
On the basis of data gathered in carefully planned observations of several species of birds, a biologist proposes a modification in the accepted theory of interspecies competition.
On the basis of a study of observations incidentally recorded in ethnographers descriptions of non-Western societies, an anthropologist proposes a new theory of kinship relations.
21. 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 well-known process
a frequent occurrence
a fleeting aberration
an unimportant event
an unexpected outcome
22. According to the passage, virtual particles differ from real particles in which of the following ways?
I. Virtual particles have extremely short lifetimes.
II. Virtual particles are created in an intense electric field.
III. Virtual particles cannot be detected directly.
I only
II only
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