单选题
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.
【正确答案】
D
【答案解析】
[解析]文章第二段第三行提到了：a surprising result。因此，an unexpected outcome与之相等。故应选D。
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