题目

22. The two boys fought and fought until one ______. A. gave up          B. gave in                C. gave                 D. gave off  答案：B 解析: give up放弃；give in屈服，让步；give away分发，发出；give off发出。5．解方程（1）（x-8）（x-1）=-12             （2）x2-6x+2=0．