Take part in one of these FUN summer camps.ID Tech Camps offer weeklong courses at locations throughout the US.Our junior courses provide additional time for off-computer activities,ensuring a well-balanced day.Learn from instructors who are passionate about technology.There is a maximum of just 8 students per instructor.Just choose a course.

    Adventures in Games Design

    Ages: 7-10

    Dates: July 1-July 7

    Cost: $520

    Don't just play games!Make them!Create your own video game in this fun,exciting video game camp for kids. Design your own arcade or platform game using professional software.Take breaks to play sports outside and do other activities.

    Adventures in Programming

    Ages: 7-13

    Date: July 4-July 10

    Cost: $750

    Let your imagination run wild in this multimedia adventure.Create your own interactive stories,animated adventures and creative comics.Learn drag-and-drop programming basics with scratch (a project of the MIT Media Lab).Computer characters are at your command!Take breaks with supervised outside sports and activities.

    Adventures in Robotics

    Ages: 12-15

    Date: July 4-July 10

    Cost: $1,200

    Imagine it,build it and watch it go!Powered by the LEGO MINDSTORMS Education NXT Base Set and Software,our Adventures in Robotics course explores the exciting world of robots!This course will have you create cool robots on your first day.

    Introduction to Web Design & Photography

    Ages: 9-12

    Date: July 14-July 20

    Cost: $700

    Use a high-end camera and learn the building blocks of web design with Adobe Dreamweaver.Put your photos into your basic website,and then share your creation with your friends and family.The software Adobe Flash may be introduced based on a student's progress throughout the week.

Movie Making Camp

    Ages: 12-15

    Date: July 14-July 20

    Cost: $1,8000

    Are you ready to learn the basics of filming and editing?

    Shoot with professional cameras and see how much fun creative editing can be with the video editor iMovie. Take home a DVD of your final project to show your family.Please remember it takes filmmakers years to master their skills.Please have realistic project expectations.

阅读下面的文言文，完成下列各题

    戴士衡，字章尹，莆田人。万历十七年进士。擢吏科给事中。蓟州总兵官王保滥杀南兵，士衡极论其罪。已，请亟补言官，劾石星误国大罪五。山东税使陈增请假便宜得举刺将吏，淮、扬鲁保亦请节制有司，士衡力争。仁圣太后梓宫发引，帝不亲送，士衡言：“母子至情，送死大事，奈何于内庭数武地，靳一举足劳。今山陵竣事，愿陛下扶杖出迎神主，庶少慰圣母之灵，答臣民之望。”锦衣千户郑一麟奏开昌平银矿，士衡以地逼天寿山，抗疏争。

    二十五年正月，极陈天下大计，言：“方今事势不可知者三：天意也，人心也，气运也。大可虑者五：纪纲废弛也，戎狄侵陵也，根本动摇也，武备疏略也，府藏殚竭也。其切要而当亟正者一，则君心也。陛下高拱九重，目不睹师保之容，耳不闻丞弼之议，美丽当前燕惰自佚即欲殚聪明以计安社稷其道无由诚宜时御便殿召执政大臣讲求化理则心清欲寡政事自修”亦不报。

    日本封事败，再劾星及沈惟敬、杨方亨，列上防倭八事，多议行。俄劾南京工部尚书叶梦熊、刑部侍郎吕坤、蓟辽总督孙幰及通政参议李春。时幰已罢，宜春自引归，坤亦以直谏去。给事中刘道亨右坤，力诋士衡，谓其受大学士张位指。士衡亦劾道亨与星同乡，为星报复。帝以言官互争，皆报寝。寻劾罢文选郎中白所知。

    先是，士衡再劾坤，谓潜进《闺范图说》，结纳宫闱，因请举册立、冠婚诸礼。帝不悦。至是有跋《闺范》后者，名曰《忧危竑议》，诬坤与贵妃从父郑承恩同盟结纳，羽翼贵妃子。承恩大惧。而全椒知县樊玉衡方上疏言国本，指斥贵妃，遂妄指士衡实为之，玉衡与其谋。 帝震怒，夜半传旨逮下诏狱拷讯。比明，命永戍士衡廉州。御史赵之翰复言：“是书非出 一人，主谋者张位，奉行者士衡。诸臣皆位心腹爪牙，宜并斥。”士衡再更赦，皆不原。四十五年，士衡卒于戍所。巡按御史田生金请脱其戍籍，帝不许。

（节选自《明史•戴士衡传》）

在比较材料隔声性能的综合实践活动中，把声源用不同材料包裹好放进鞋盒里，小明逐步远离声源，直至听不见声音为止，比较此处距鞋盒的距离．下列说法正确的是（　　）

$\frac{2}{9}+x=\frac{5}{6}$

x=____

如图，四边形ABCD是⊙O的内接四边形，若∠A=70°，则∠C的度数是（　　）