英语

　　1.MUN, which ( ) Model Untions is a conference that provides students all ever the world with the opportunity to experience what it’s like to be the United Nations.

　　A. stand by

　　B. stands for

　　C. stand up

　　D. stand out

　　【答案】B。考查词汇辨析。A项：支持;B项：代表;C项：起立;D项：突出、坚持。题目中的意思是指“MUN代表的就是Model Unions......”，故选项B正确。

　　2.It is of high importance that you ( ) at the airport on time.

　　A. arrive

　　B. are to arrive

　　C. must arrive

　　D. end to arrive

　　【答案】A。考查虚拟语气。it is of high importance that后面要用虚拟语气，should+V，其中should可以省略。故选项A正确。BC选项均不符合;D项：end to“结束、到了”，不符合原文意思，排除。