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Twenty years ago, kids in school had never even heard of the Internet. Now, I’ll bet you can’t find a single person in your school who hasn’t at least heard of it. (76) In fact, many of us use it on a regular basis and even have access to it from our homes! The “net” in Internet really stands for network. A network is two or more computers connected together so that information can be shared, or sent from one computer to another. The Internet is a vast resource for all types of information. (77) You may enjoy using it to do research for a school project, downloading your favorite songs or communicating with friends and family. Information is accessed through web pages that companies, organizations and individuals create and post. It’s kind of like a giant bulletin board (布告牌) that the whole world uses! (78) But since anyone can put anything on the Internet, you also have to be careful and use your best judgment and a little common sense.Just because you read something on a piece of paper someone sticks on a bulletin board doesn’t mean it’s good information, or even correct, for that matter. So you have to be sure that whoever posted the information knows what they’re talking about, especially if you’re doing research! But what if you’re just emailing people You still have to be very careful. (79) If you’ve never met the person that you’re communicating with online, you could be on dangerous ground! You should never give out any personal information to someone you don’t know, not even your name! And just like you can’t believe the information on every website out there, you can’t rely on what strangers you “meet” on the Internet tell you either. (80) Just like you could make up things about yourself to tell someone, someone else could do the same to you!76.77.78.79.80. If you’ve never met the person that you’re communicating with online, you could be on dangerous ground!

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如果你想学好英语,你就有必要尽量多讲。

如下程序声明了一个二维图形类TwoDShape,从其派生出矩形类Rec。 #include<iostream> #include<string> using namespaee std, class TwoDShape{// 二维图形类 char name[20]; public: TwoDShape (char * n="unknown") { strcpy(name, n); } Char * getName(){return name;} 【14】 =0; }; class Rec: public TwoDShape{ double width, height public: Rec(double w-=0. 0,double h=0. 0):TwoDShape("rectangle") { width=w; height=h; } double getWidth() {return width;} double getHeight() {return height;} double area() {return width * height;} }; int main() { TwoDShape * shape; Shape=new Rec(2.1,3.0); cout<<"object is"<<shape->getName()<<"\n"; cout<<"Area is"<<shape->area()<<"\n"; return 0 } 请将程序补充完整,使程序在运行时输出: abject is triangle Area is 6.3

甲、乙型血友病检查对下列疾病检查有意义的试验()

A. 纤维蛋白肽A测定
B. 骨髓细胞学检查
C. 血小板抗体PAIgG检测
D. 简易凝血活酶生成试验
E. 血小板黏附及聚集功能测定

证券公司接受委托卖出证券不必是客户证券账户上实有的证券,且可以为客户融券交易。

A. 对
B. 错

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