【正确答案】 B

【答案解析】[听力原文] 28-30 It's no secret that throughout history common stock has outperformed most financial instruments. If an investor plans to have an investment for a long period of time, then their portfolio should be comprised mostly of stocks ; however, investors who don't have this kind of time should diversify their portfolios. For this reason, the concept of "asset allocation" was developed. Asset allocation is an investment portfolio technique that aims to balance risk and create diversification by dividing assets among major categories. The underlying principle of asset allocation is that the older a person gets, the less risk he or she should face. After you retire you may have to depend on your savings as your only source of income. 28. Throughout history, what kind of stock has outperformed most financial instruments? 录音原文一开始就提到It's no secret that throughout history common stock has outperformed most financial instruments，纵观历史，普通股表现优于其他绝大多数金融工具不是秘密。

【正确答案】 A

【答案解析】[听力原文] What is the purpose of asset allocation? 录音原文提到Asset allocation is an investment…by dividing assets among major categories．资产组合是一种投资组合工具，通过将资产分为几大类，制造出多样化的组合，以达到风险分散的目的。

【正确答案】 B

【答案解析】[听力原文] What is the principle underlying the concept of asset allocation? 录音原文提到The underlying principle of asset allocation is that…should face．资产组合隐含的原理是：人的年龄越大，所面临的风险应该越小。