填空题

Two of the most vital functions performed in any economy are

【参考答案】

saving and investment
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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.
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