题目

Many policemen and soldiers are ______ the forest _____ the prisoner escaping from prison.     A. searching for; searching                  B. searching; searching     C. searching; in search of                    D. in search for; searching for 答案：C 解析: 根据第一空，排除B、D， in search of = in one’s search for。第二空in search of 这里相当于to search for，表示目的。在图中，能正确表示小磁针静止时N极指向的是（ ）A．B．C．D．