参考答案

正确答案：A
解析：据说地震前某些动物的行为会变得非常反常。句中abnormal：反常的。strange：奇怪的, 如：It's strange that he's failed in the exam．他竟然不及格, 真是想不到。mild：温和的, 如：He is the mildest man alive．他是世上最和善的人了。rude：粗鲁的, 如：It's strange for her to be so rude．真奇怪, 她竟然会如此粗暴无礼。normal：正常的, 如：The doctor said the child's temperature was normal．医生说孩子体温正常。只有strange意思上和abnormal最接近。