题目

根据句意和首字母提示补全单词。 66. Mr. Smith can o_____ his guests some coffee or tea when they come to his home. 67. Today, everyone o_____ to be a greener person. 68. I felt a sharp pain in my c_____. 69. He is the s_____ of person who only cares about money. 70. We must remember that n_____ of us is infallible (永无过失的). We all make mistakes. 答案：66.    offer   67.   ought    68.   chest    69.  sort      70.   none         二元一次方程组的解是 (　　) A． 　　B． 　　C． 　　D．