XYZ LTD is concerned about the security in the perimeter of the network. Which three Cisco products can you offer to XYZ LTD?（）
第1题：
阅读下面程序
public class Test3{
public static void main(String args[]){
int x=3,y=4,z=5;
String s= " xyz " ;
System.out.println(s+x+y+z);
}
}
程序运行的结果是
A)xyz12
B)xyz345
C)xyzxyz
D)12xyz
第2题：
Thomas: Hey, you look concerned.______
Jack: The final exam. I'm not fully prepared yet.
A、What a lovely day!
B、What has attracted you?
C、What's on your mind?
D、What about seeing the doctor?
第3题：
(A)in
(B) about
(C) with
(D) for
正确答案：C
解答参考：C此题考察词组搭配be concerned about 关心，担心;be concerned with 与……有关，忙于 【译文】有四个人在管儿童教育方面的事。
第4题：
第5题：
第6题：
A、concerned about
B、concern about
C、concerns about
D、concerning about
第7题：
阅读下面程序 public class Test3 { public static void main(String[] args) { int x=3,y=4,z=5； String s="xyz"： System.out.println(s+x+y+z)； } } 程序运行的结果是
A．xyz12
B．xyz345
C．xyzxyz
D．12xyz
第8题：
A.”abcxyz”
B.”xyzabc”
C.”abc”
D.”xyz”
第9题：
第10题：
You have been asked to configure a default route. Which of the IOS commands mentioned below will accomplish this task?（）