下列操作中能在中文输入法间切换的是（）。A、用Ctrl+Shift键 B、用Alt+空

如图为一小球做平抛运动的闪光照片的一部分.图中背景方格的边长均为2.5cm，如果取重力加速度g=10m/s²，那么：

（1）照片的闪光频率为________Hz。

（2）小球做平抛运动的初速度的大小为______m/s。

A report by the Consumer Electronics Association says electronics are among the most popular gifts being bought this holiday season. 

Jim Barry is a spokesman for the Consumer Electronics Association. He says the CEA study found that electronics represent three of the top five things on its "holiday gift wish list" this year.

JIM BARRY: "Notebook computers are at the top, followed by iPads and then e-readers. IPad is a touch-screen tablet computer and that's really the big player in that category."

The computer company Apple began selling its small, touch-screen computers in April.   People use the touch-screen computers to surf the Web, write e-mails, watch movies and read books. Since the iPad's release earlier this year, several other companies have come out with their own tablet computers just in time for Christmas.

A report from the e-Marketer research group predicts that worldwide, tablet sales will reach more than eighty-one million in two thousand twelve. Still, Jim Barry says these devices are facing tough competition this year from another Christmas favorite.

JIM BARRY: "Another hot category right behind that are the e-readers. So you can read on an iPad or a touch-screen tablet, but the e-book readers are less expensive. The Kindle is the market leader there, from Amazon. But you also have the Nook from Barnes and Noble and the e-reader from Sony. And you have more and more of those e-readers coming into the market as well."

The Consumer Electronics Association report found that iPod music players are also in high demand this holiday season.  

But not all of the things on the holiday gift wish list involved electronics. Clothes, cars and motorcycles also made the list. So did family togetherness and good health. And the one thing that people wanted most?

JIM BARRY: "At the top of the list was peace and happiness."

That is also our wish for you this holiday season.

小题1:The best title of the passage is         .  

A．How to choose a suitable gift for Christmas

B．iPads, E-Readers, Notebook Computers top wish lists

C．What we should buy for our kids this holiday season

D．How modern technology is changing the way people relate小题2:People use the touch-screen computers to do all the following things except         .  

A．surf the Web and write e-mails

B．watch movies and read books

C．surf the Web and contact others on phone

D．surf the internet and use it as an e-reader小题3:Which of the following sentences is TURE?  

A．iPads are the most popular gift among all the electronics.

B．Only the computer company Apple releases a touch-screen tablet computer.

C．All of the things on the holiday gift wish list are electronics.

D．There are more and more kinds of e-readers in the market.小题4:You don't have enough money for an iPad, but you can buy          for a friend who enjoys reading.  

A．notebook computers

B．iPod music players

C．touch-screen tablet computer

D．e-book readers小题5:We can infer from the last paragraph that         .  

A．people value peace and happiness more than anything else

B．clothes, cars and motorcycles are also popular gifts for Christmas

C．family togetherness and good health don't make the list

D．JIM BARRY also sends their wish for us this holiday season

完成句子。

1.保持健康对我们来说很重要.

   It is important for us ______ _______ _______.

2. 我们应该知道怎样学习.

    We should know _______ _____ _______.

3. 运动员每天需要大量的能力进行锻炼.

    Every day a player needs ________ _______energy _______training.

4.稍等,汤姆马上就来. 

   ______ ______ _______,Tom is coming.

5.黄河公园的确是个好玩的去处.

   Huanghe Park is a________ good place ____ ____.

继电器一般性检验项目有（）。

A.外部检查

B.内部及机械检查

C.绝缘检验

D.继电器线圈电阻的测定

E.继电器触点工作可靠性检验

下列关于中国古代历史的叙述，不正确的是( )。
①氏族公社形成的条件和基本标志是一夫一妻制
②姜寨遗址是比较典型的母系氏族公社的村落遗址
③发生在父系氏族公社的第二次社会大分工指的是手工业从农业中分离出来
④母系氏族公社时期，部落首领选举依靠推荐和选举，这种民主选举制度称为禅让制
⑤取代《氏族志》的《姓氏录》编纂于唐玄宗时期
⑥战国时期的天文学家齐人甘德和魏人石申各自写出一部天文著作，后人把这两部书合编成《甘石星经》，这是世界上最早的天文学著作

A．①③⑥

B．②④⑥

C．②③⑥

D．①④⑤