以：①先帝不以臣卑鄙____       ②故临崩寄臣以大事也____

③受命以来，夙夜忧叹____      ④以塞忠谏之路也____

⑤以光先帝遗德____

于：①还于旧都____        ②未尝不叹息痛恨于恒、灵也____

③苟全性命于乱世____

所以：①此后汉所以倾颓也____        ②此臣所以报先帝而忠陛下之职分也____

探究凸透镜的成像规律，实验装置如图所示，物距用u表示，焦距用f表示。当u>2f时，光屏上得到一个清晰、____ 、缩小的实像（选填“倒立”或“正立”）；若想得到一个清晰放大的实像，蜡烛应向____ 凸透镜的方向移动（选填“远离”或“靠近”），同时光屏应向远离凸透镜的方向移动。

    You may know about “junk food” like French fries.But do you know about “junk sleep”？

    Recently, a British survey found that electronic(电子的) products in teenagers' bedrooms are affecting(影响) their sleep.

    The survey was done among 1，000 British kids from 12 to 16.It found that 30% of them got just 4 to 7 hours of sleep every day.But doctors say they need 8 to 9 hours.

    Almost a quarter of the kids said they fell asleep more than once a week while watching TV, listening to music or using other electronic products.

    “This is very worrying，” said Dr.Chris Idzikowski，a British expert，“We call it 'junk sleep'．It means you don't get enough sleep and the quality of the sleep is bad, too.If you don't get a good rest，you don't perform well in school the next day.”

    The survey found that 40% of the kids felt tired each day，with girls between 13 and 16 feeling the worst.Nearly all the teenagers have a cellphone，an iPad or a TV in their bedrooms.And many of them have all the three.