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　　习题：
　　Exercise：
　　Which of the following best describes the GMB MCS?
　　A     Stochastic drift (scaling with time) plus deterministic shock (volatility scaling with square root of time).
　　B     Stochastic drift (scaling with square root of time) plus deterministic shock (volatility scaling with time).
　　C     Deterministic drift (scaling with time) plus stochastic shock (volatility scaling with square root of time).
　　D     Deterministic drift (scaling with square root of time) plus stochastic shock (volatility scaling with time).
　　Answer: C
　　Deterministic drift (scaling with time) plus stochastic shock (volatility scaling with square root of time).