单选题
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.
【正确答案】
A
【答案解析】
[解析]文章主要谈论的是真空、波动和衰减。故应选A。
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