题目

 The river,       the bank are covered with trees, is very long. A. whose       B. which   C. of which     D. which of 答案：C。名词或代词+关系代词whom / which可以引导非限定性定语从句。表示部分与整体的关系，作用相当于whose+名词，of which the bank =the bank of which = whose bank, 因此答案为C。从石油中获得汽油的方法是（　　）A．分馏B．蒸发C．干馏D．催化氧化