郊区环境下倾角一般控制在（）至（）度左右。

根据对话内容，在空白处填写一个适当的话语（话语可能是个句子，也可能是一个短语或一个词），使对话完整。

(Father is talking about the exam with his son in the room.)

Father: You have been working hard on your studies these days.        1        ?  

Son: Yes,  very tired.  But I have to keep working hard.  You know,  the final exam is coming soon.

Father: I know it's important to you.  

Son: Of course.  It's more important        2         any other kind of exam.

Father: You are right. But you don't need to        3         it.  I believe you can get good grades.  

Son: But Chinese troubles me a lot.  I am afraid         4        .

Father: I don't think .so.  

Son : Sometimes I just have no idea about compositions (作文).

Father: Don't worry. Many students may feel the same as you.  

Son:         5       . but I will still work harder at it.

Father: If so, you'll  pass it.  

Son: I hope so.

以下4个程序中,完全正确的是【 】。

A．#include main()； {／*programming*／printf("programming!＼n")；}

B．#include main(){／*／programming／*／ printf("programming!＼n")；}

C．#include main() {／*／*programming*／*／ printf("programming!＼n")；}

D．include main(){／*programming*／printf("programming!＼n")；}

婴幼儿疟疾的特点包括（）。

A.发热多不规则

B.常有呕吐和腹泻

C.病情重时可出现感染性休克和惊厥

D.脾大，显著贫血

E.血片中易查到疟原虫

土地管理的基本内容是什么？其相互关系是什么？