后掠翼为什么翼尖先失速？改善后掠翼飞机翼尖失速特性的措施有哪些？

根据课文内容填空。

1．“昨天是我的眼睛骗了我，那‘鸟的天堂’的确是鸟的天堂啊！”这句话中加引号的“鸟的天堂”是指____________________________，不加引号的是指____________________________________。

2．钱塘江大潮的形成和当地特殊的____________有关。

3．自古以来，钱塘江大潮被称为________。________和________咫尺为邻，构成了堪称世界第一的壮丽景观。

关于安全用电常识，下列说法中不正确的是（　　）

A．不能用铜丝和铁丝代替保险丝

B．电线上不能晾衣服

C．如果发生触电事故，要立即切断电源

D．使用试电笔时，只要用笔尖接触被测的导线即可

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

脑出血急性期先用（）。

A.改善微循环药物

B.脱水药降颅内压

C.兴奋药

D.抗癫痫药

E.维生素