题目

假定你是李华，是你校模拟联合国大会 负责人。你校将举办第五次模联活动，请给你们的外教Smith老师写封信，邀请他担任指导老师（advisor）。信的内容包括：1. 主题：全球气候；2. 举办时间和地点3. 指导老师的任务。注意：1. 词数100词左右；2.可以适当的增加细节，以使行文连贯。 答案：Dear Mr. Smith,Our school MUN is going to hold the fifth Model United Nations on November 10 and 11 in Meeting Rooms One, Two and Three. The theme is global climate. We sincerely invite you to be one of the advisors.There are some new members in MUN, and the process, how to prepare for MUN and how to write the position paper, etc. are too complicated for them. Therefore, advisors are needed to tra15．如图所示，用恒力F拉着质量为m的物体沿水平面从A移到B的过程中，下列说法正确的是（　　）A．有摩擦力时比无摩擦力时F做的功多B．物体加速运动时比减速运动时，F做的功多C．物体无论是加速运动、减速运动还是匀速运动，力F做的功一样多D．有摩擦力时与无摩擦力时F的平均功率不相等