女，25岁，经常胸闷心悸，经检查诊断为二尖瓣脱垂，其体征应具有（）

A.第一心音亢进

B.开瓣音

C.收缩早期喷射音

D.心尖区舒张期杂音

E.收缩中晚期喀喇音

Advantages related to investments in mutual funds include all of the following except（）

A. Mutual funds provide an investor with asset diversification as well as consistent risk-return preferences.

B. Mutual funds allow the investor to shift between alternative investment instruments easily while maintaining good records, dividend reinvestment and timely information for tax purposes.

C. Mutual funds provide investors with superior risk-adjusted returns.