下面哪一款应用设计属于树形结构导航？（） A: iOS邮件应用 B: iOS天气预报 C: Passbook D: iBook

Which one of the following savings plans is not covered by federal deposit insurance? A: passbook account at a savings and loan B: regular checking account at a commercial bank C: money market account at a commercial bank D: money market fund with an investment company E: certificate of deposit at a commercial bank