題目： 「冷戰（1946－1991）的一個特徵是美國的抗共政策有成效便持續，無效力便作出調整或改變。」你是否同意此說？試提出理據，支持你的看法。
Question: ‘One of the characteristics of Cold War (1946-1991) was that the US would continue her anti-communist policy if it was effective, and would adjust or change if it was ineffective.’ Do you agree? Justify your view.