题目

It is in Steven Spielberg' s first film, Jaws, ____ a big white shark attacks swimmers ____ are spending their holidays in a small village by the sea. A. where; who   B. which; that        C. that; that      D. where; that   答案：C该题考查定语从句在强调句中混合运用时连词的辨析。第一空所选that为强调句之连词，第二空所选that为定语从句之关系代词。边长为a的正方体八个顶点上各有一电荷为q的点电荷，它们在上面中心O形成的合场强大小是（ ）A．0B．C．D．