Mid（“I am a student.”，9，2）的返回值是什么？（）A、“st”B、“nt”C、“tu”D、“en”

请分析下列程序。 int main() { printf("This is in main program"); if(fork()==0) printf("I am in child process"); else printf("I am in parent process");} 程序正确运行后结果是

A.This is in main program I am in child process I am in parent process

B.This is in main program I am in child process

C.This is in main program I am in parent process

D.This is in main program I am in child process This is in main program I am in parent process

对于如下C语言程序 int main() { pid_t pid; int x=1; pid = fork(); if(pid==0) printf("I am the child process, x=%d\n", ++x); else printf("I am the parent process, x=%d\n", --x); } 在UNIX操作系统中正确编译链接后，其正确的运行结果是

A.I am the child process, x=2

B.I am the parent process, x=0

C.I am the parent process, x=2

D.I am the child process, x=0

A、I’d love to, but I am busy tonight

B、No, you can’t

C、Yes, but I am busy

D、I don’t know

我是一名水手，在船上干二水。

A.I am a sailor. I work as an OS on board

B.I am an AB I work as a sailor.

C.I am a sailor. I work as a quartermaster.

D.I am an AB I work as an oiler.

A:I am from England.

B: ( ).

A. So am I

B. So do I

C. So have I

4．—Are you her uncle?

—_________

A．I’m not

B． Yes， I am not

C． No， I am

D． No， I am not

A:What do you do?

B: ( ).

A. I am washing the dishes now

B. I am a policeman

C. I do my homework

Which of the following is closest in meaning with the sentence: "I am feeling black"?

A. I am sad.

B. I am feeling well.

C. I am dirty.

D. I am very tired.

- Mary, I am calling to tell you that I got the highest scores in the mid-term exam.

- _________.

A、Good luck.

B、Really?

C、That's all right.

D、Congratulations.

设有如下程序： Private Sub Form. Click（ ） Cls a$="1234j6" For i=1 To 6 Print Tab(12-i)；________ Next i End Sub 程序运行后，单击窗体，要求结果如图所示，则在______处填入的内容为（ ）。

A.Left(a$，i)

B.Mid(a$，8-i，i)

C.Right(a$，i)

D.Mid(a$，7，i)