题目

计算下列各题，能简算的要简算．+﹣﹣（ +）﹣（ ﹣ ）+++． 答案：【答案】1；；；1【解析】试题分析：（1）直接运用分数的加减法进行计算即可得到答案；（2）先利用加法交换律，交换与的位置，再用减去再减去，最后结果不变；（3）直接运用分数减法进行计算即可得到答案；（4）利用加法交换律交换与的位置，然后再利用加法结合律进行计算即可得到答案．解请认真阅读下面对话，并根据各题所给首字母的提示，写出一个英语单词的完整、正确形式，使对话通顺。 M=Mary T=Tom M:  Hi, I'm going door to door tonight to tell people about the Student Action Union. T:  I think I read something in the (76)n       last week. M:  Yeah, we are trying to (77) p       and preserve some of the open spaces on campus. T:  You are the group that's (78) a　　　　against the extension of the parking lot next to Darwin Hall,     right? M:  That's us. We just feel it is important to save some of the (79) n       beauty of the campus.     Some of those trees are hundreds of years old. T:  It's a pretty (80) p       . My friends and I had picnics over there by the stream. M:  We are going to (81) o     a demonstration on Thursday afternoon. T:  Well, I have a class on Thursday afternoon. M:　But maybe you could (82) s     this appeal letter. We are going to hand it in to the administration     to demonstrate how the students feel about this. T:  Sure, let me get a pen. M:  I have a pen right here. And let me (83) l        you this little book about the Student Action     Union. Maybe you could come to some of our meetings. We get (84) t     once a month. T:  Yeah, I'd like to know more about your group. Let me know (85) w      the next meeting is and I     will try to be there.