与人类关系最近的类群是（ ） A．鱼类 B．两栖类 C．爬行类 D．哺乳类

土地增值税的纳税人为转让土地使用权，地上建筑物及其附着物并取得收入的单位和个人。 ( )

根据汉语提示写出单词。

1. Last Wednesday, our teacher told us to write an          (文章) about Christmas.

2. —Would you like to be a         (社会的) worker when you grow up?  

    —Yes, I'd like to help people solve their problems.

3. In the wetlands, birds can          (不费力地) catch some fish for food.

4. It's her first time to leave home alone for such a long time, so she          her parents very much.

5. Many people still don't know the importance of          (keep something or somebody safe from danger) wildlife.

国家职业球童草案对于球童的职业等级分为初级、中级和高级三个级别

负责统一印制《从业资格证书》和《执业资格证书》的部门是( )。

A．有关业务主管部门
B．国家人事考试中心
C．国家工商行政管理总局
D．国家人力资源和社会保障部

将一个项目编译成一个应用程序时，如果应用程序中包含的文件不允许用户修改，则必须将该文件标为______。