题目

A quarrel________between the couple, which made their son break away from the family.A.broke into B.broke up C.broke down D.broke out 答案：【答案】D【解析】句意：这对夫妇吵架了，使他们的儿子离家出走了。考查动词短语辨析。broke into闯入；broke up分手；broke down损坏；broke out爆发，根据所给空前面的the quarrel可知，broke out最符合语境，故选D。（1）已知：如图1，点C为线段AB上一点，△ACM，△CBN是等边三角形，求证：AN=BM，这时可以证明 ≌ ，得到AN=BM；（2）如果去掉“点C为线段AB上一点”的条件，而是让△CBN绕点C旋转成图2的情形，还有“AN=BM”的结论吗？如果有，请给予证明．