板间距为d的平等板电容器所带电荷量为Q时，两极板间电势差为U₁，板间场强为E₁．现将电容器所带电荷量变为2Q，板间距变为 $\frac{1}{2}$ d，其他条件不变，这时两极板间电势差U₂，板间场强为E₂，下列说法正确的是（   ）

我国首艘国产航母于今年4月26日下水，这标志着我国军事新的里程碑，也显示了我国已拥有制造战斗级航母的能力。中国制造战斗级航母（    ）

①展示了我国海军日益增强的实力         ②表明了我国捍卫海洋主权的决心

③向世界证明中国将成为世界的主导     ④意味着我国在海军作战方面能与美国抗衡

下面是李明同学对北京人一天生活的描述，正确的是（  ）

北宋范仲淹在杭州知州任上遇到“两浙路大饥荒，道有饿殍，饥民流移满路”。他创造性地实施了“荒政三策”。大兴公私土木之役（既进行了杭城建设，又解决了大量饥民失业流离之苦）、纵民竞渡（大兴旅游业，增加就业）、引四方商贾争相进米（抑制粮价）。范仲淹的“荒政三策”条条奏效。范仲淹“荒政三策”蕴涵的经济学道理有
①物价水平是消费水平的基础    
②就业是民生之本，对社会生产有重要意义
③商品的价格受供求变化影响    
④宏观调控在资源配置中起基础性作用

   Linda is a 15-year –old American girl. She is outgoing and likes making friends. Her parents are very   1 .They have no tome to stay with Linda,  2she spends a lot of time on the Internet(网络) every day. She likes  3    with other people on QQ and her QQ name is Lily.
   Last year, Linda got to know a young man on the Internet.  4 name is Mike. Mike is 18 years old. He lives  5  Toronto, Canada. He is very friendly and 6
   He likes to tell jokes and makes Linda happy. Linda talked with him on QQ for long hours every night. A few days later, Mike posted a 7 of himself(他自己) to Linda. He is 8 and good-looking in the photo. Linda likes him very much and they become good friends.
   Last month, Linda’s parents went to Toronto for a meeting (会议). Linda wanted to visit his friend Mike. She asked her parents to  9her there. When Linda arrived at Mike’s house, she found her 10was only a nine-year-old boy .He wasn’t that tall man in the photo. How surprised Linda was!