单项选择题 货币市场基金合计投资于现金、国债,中央银行票据、政策性金融债券占基金资产净值的比例合计不得低于（　　）

未知题型 How does the author now keep in touch with friends when at sea?A.By making telephone calls from time to timE.B.By sending and receiving e-mail on board their boat.C.By sending faxes with their laptop computer.D.By creating a radio-updated Website on the Internet

单项选择题 根据基金的运作方式的不同，证券投资基金可划分为（　　）