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一、精心选一选.(本大题满分30分,共10小题,每小题3分)下列各小题都给出了四个选项,其中只有一个符合题目要求,请把符合题目要求的选项前的字母代号填写在题后的括号内.1.-2的相反数是()A.-2B.2C.21D.-212.今年小明m岁,小刚n岁,5年后小明与小刚的年龄之和是()A.m+n+5B.5(m+n)C.
First, carefully selected one. (This topic scored 30 points, a total of 10 small questions, each question 3 points) The following questions are given four options, of which only one meets the requirements of the title, please meet the requirements of the title The letter code before the option is filled in the parenthesis after the question. The opposite of 1.-2 is () A.-2B.2C.21D.-212. This year, Xiao Ming is aged m, Xiao Gang is n years old, and after 5 years, Xiao Ming The sum of Xiao Gang’s age is ()A.m+n+5B.5(m+n)C.