Text 3
Scientists Johan Feenstra and Rob Hayes think they’ve figured out how a process called electrowetting can make paper that can do anything a videoscreen does. So far, though, all they’ve got to show for their efforts is a tiny piece of e-paper one centimeter square--only 225 pixels, or picture elements. That won’t be nearly enough for headlines and news videos. The only hint of the technology’s potential is a laptop presentation the inventors have set up. It features Professor Shape, Harry Potter’s teacher, holding an electronic newspaper with an embedded video clip. "That’s what we want," says Hayes.
They’re likely to get it. Late last month in Tokyo, Sony took an important leap in this direction by introducing Librie, an e-book reader. Although it’s available only in black and white, Librie has the most important characteristic of paper: it reflects natural light. That means it can be read on sunny days or viewed from any angle. You can even choose your own font size. Is this finally the beginning of the end of paper
The answer is closer to "yes" than you may think. The holdup so far has been user-unfriendly screens, but now e-paper no longer relies on back-lit displays. A reflective display is easy on the eyes, with twice the contrast of computer screens and up to six times the brightness. It uses power only when changing the page, so a battery can last 300 hours. Several firms are competing for leader ship. The Philip’s display on Librie uses technology from Massachusetts-based E-Ink Corp. An electric charge moves either black or white capsules to the surface of the page in patterns that form images. Gyricon Media uses rotating balls with one black side and one white side for signs and bill boards. Other companies are focusing on improvements in liquid-crystal displays.
The next challenge is to add color. One option for books would be a simple color filter, but that would block two thirds of the light. Guofu Zhou, who runs the E-Ink project for Philips, thinks products with colored ink can be ready for the market within seven years. He’s now focusing on e-paper that can display 16 or more gradations of gray, which would come in handy in medical imaging or to display black-and-white photographs at home.
Labs around the world are also racing to design a robust yet flexible backing. Philips researchers are working on a technology for laminating E-Ink on a plastic layer instead of glass, which would then roll into a pen-sized tube. A flexible product for mobile phones and digital cameras can be ready in three to five years.

A:the back-lit displays is already sophisticated. B:the Philip's display has the latest E-Ink technology. C:Gyricon Media has rotating balls technology. D:the technology barrier is about to be removed.

Text 3 Scientists Johan Feenstra and Rob Hayes think they’ve figured out how a process called electrowetting can make paper that can do anything a videoscreen does. So far, though, all they’ve got to show for their efforts is a tiny piece of e-paper one centimeter square--only 225 pixels, or picture elements. That won’t be nearly enough for headlines and news videos. The only hint of the technology’s potential is a laptop presentation the inventors have set up. It features Professor Shape, Harry Potter’s teacher, holding an electronic newspaper with an embedded video clip. "That’s what we want," says Hayes. They’re likely to get it. Late last month in Tokyo, Sony took an important leap in this direction by introducing Librie, an e-book reader. Although it’s available only in black and white, Librie has the most important characteristic of paper: it reflects natural light. That means it can be read on sunny days or viewed from any angle. You can even choose your own font size. Is this finally the beginning of the end of paper The answer is closer to "yes" than you may think. The holdup so far has been user-unfriendly screens, but now e-paper no longer relies on back-lit displays. A reflective display is easy on the eyes, with twice the contrast of computer screens and up to six times the brightness. It uses power only when changing the page, so a battery can last 300 hours. Several firms are competing for leader ship. The Philip’s display on Librie uses technology from Massachusetts-based E-Ink Corp. An electric charge moves either black or white capsules to the surface of the page in patterns that form images. Gyricon Media uses rotating balls with one black side and one white side for signs and bill boards. Other companies are focusing on improvements in liquid-crystal displays. The next challenge is to add color. One option for books would be a simple color filter, but that would block two thirds of the light. Guofu Zhou, who runs the E-Ink project for Philips, thinks products with colored ink can be ready for the market within seven years. He’s now focusing on e-paper that can display 16 or more gradations of gray, which would come in handy in medical imaging or to display black-and-white photographs at home. Labs around the world are also racing to design a robust yet flexible backing. Philips researchers are working on a technology for laminating E-Ink on a plastic layer instead of glass, which would then roll into a pen-sized tube. A flexible product for mobile phones and digital cameras can be ready in three to five years.

A:the back-lit displays is already sophisticated. B:the Philip's display has the latest E-Ink technology. C:Gyricon Media has rotating balls technology. D:the technology barrier is about to be removed.

在图形显示系统的类层次结构中，类Shape定义了“图形”所具有的公有方法：display（　），并将其声明为抽象方法：类Line是Shape的子类。则下列说法中正确的是 (1) 。若类Line正确继承了Shape类，并定义了方法display(int N)，这种机制称为 (2) 。这样，通过Shape对象的正确引用就能实现Line对象的相应方法，体现了面向对象程序设计语言基本特征中的 (3) 。

A:类Shape可进行实例化 B:可通过类名Shape直接调用方法display C:类Line必须重置方法display D:类Line,必须重载方法display

有下面的程序段，其功能是按下图左图所示的规律输出数据：
Dim a(3,5)As Integer
For j=1 To 3
For j=1 To 5
a(i,j)=i+j
Print a(i,j)；
Next
Print
Next
若要按下图右图所示的规律继续输出数据，则接在上述程序段后面的程序段应该是( )

A:For i=1 To 5 For j=1 To 3 B:Print a(j,i); C:Next D:Print E:Next F:B.For i=1 To 3 G:Forj=1 To 5 H:Print a(j,i); I:Next J:Print Next K:For j=1 To 5 L:For i=1 To 3 M:Print a(j,i); N:Next

有以下结构体说明和变量定义，如下图所示，指针p、q、r分别指向一个链表中的三个连续结点。 struct node int data; struct node *next; *p, *q, *r; data next data next data next 现要将q和r所指结点的先后位置交换，同时要保持链表的连续，以下错误的程序段是( )。

A:r→next=q; q→next=r→next; p→next=r; B:q→next=r→next; p→next=r; r→next=q; C:p→next=r; q→next=r→next; r→next=q; D:q→next=r→next; r→next=q; p→next=r;

有以下结构说明和变量定义，指针p、q、r分别指向链表中的3个连续结点。
struct node
int data; struct node*next; ) *p, *q, *r;
现要将q所指结点从链表中删除，同时要保持链表的连续，以下不能按要求完成操作的语句是( )。

A:p-＞next=q-＞next; B:p-next=p-＞next-＞next; C:p-＞next=r; D:p=q-＞next;

若以下定义：struct link{ int data； struck link *next；}a，b，c，*p，*q；且变量a和b之间已有下图所示的链表结构： 指针p指向变量a，q指向变量c，则能够把c插入到a和b之间并形成新的链表的语句组是( )。

A:next=c； next=b； B:next=q； next= next； C:p-＞next=&c; q-＞next=p＞next； D:(*.next=q;(*.next=&b；

有F面的程序段．其功能是按图1所示的规律输出数据 Dim a(3，5)As Integer For i=1 To 3 For i=1 To 5 a(i，j)=i+j Print a(i，j)； Next Print Next 若要按图2所示的规律继续输出数据，则接在上述程序段后面的程序段应该是（）

A:For i=i To 5 For j=1 To 3 Print a(j，i)； Next Print Next B:For i=1 To 3 For i=1 To 5 Print a(j，i)； Next Print Next C:For j=1 To 5 FOr i=1 TO 3 Print a(j，1)； Next Print Next D:For i=1 To 5 For j=1 To 3 Print a(i，j)； Next Print Print Next Next

有下面的程序段，其功能是按图1所示的规律输出数据 　　Dim a(3,5) As Integer 　　For i=1 To 3 　　For j=1 To 5 　　A(i,j)=i+j 　　Print a(i,j); 　　Next 　　Print 　　Next 　　若要按图2所示的规律继续输出数据，则接在上述程序段后面的程序段应该是（）

A:For i=1 To 5　　For j=1 To 3　　Print a(j,i);　　Next　　Print　Next B:For i=1 To 3　　For j=1 To 5　　Print a(j,i);　　Next　　Print　　Next C:For j=1 To 5　For i=1 To 3　　Print a(j,i);　　Next　　Print　　Next D:For i=1 To 5　　For j=1 To 3　　Print a(i,j);　　Next　　Print　　Next