题目

When I entered Berkeley, I hoped to acquire a scholarship. Having been a Straight-A student, I believed I could    1    tough subjects and really learn something. One such course was World Literature given by Professor Jayne. I was extremely interested in the ideas he    2   in class. When I took the first exam, I was    3    to find a 77, C-plus, on my test paper,   4   English was my best subject. I went to Professor Jayne, who listened to my arguments but remained    5   . I decided to try harder, although I didn’t know what that    6    because school had下列溶液中，能大量共存的离子组是（ ）A．K+、Na+、CO32-、NO3-B．Ag+、Na+、SO42-、Cl-C．OH-、HCO3-、Ca2+、Na+D．Ba2+、Na+、OH-、SO42-