“是书何以作？曰为以夷攻夷而作，为以夷款夷而作，为师夷长技以制夷而作。”该书指的是（ ）
答案：B
It was stupid ____ him for help. Everyone knows that he is very mean.
A．you ask
B．for you to ask
C．of you to ask
D．of you asking
基金管理人、代销机构应当建立健全档案管理制度，妥善保管基金份额持有人的开户资料和与销售业务有关的其他资料，保存期不少于( )年。
A．5
B．10
C．15
D．20
