下列说法：
①无理数都是无限小数；
②$\sqrt{9}$的算术平方根是3；

③数轴上的点与实数一一对应；
④平方根与立方根等于它本身的数是0和1；
⑤若点A（-2，3）与点B关于x轴对称，则点B的坐标是（-2，-3）．
其中正确的个数是（　　）

下列说法错误的是（　　）

在老师的指导下，张某等同学完成了以“城市垃圾状况分析及处理”为主题的社会调查，并向当地环保部门提出具体的建议。在这一活动中，张某等同学（    ）

①承担了属于环保部门的工作      ②行使了参与保护环境的权利

③增强了创新意识和实践能力      ④干涉了政府部门的工作

白蚁以木头为食，但它自身不能消化木纤维，白蚁肠内的鞭毛虫能够将木纤维分解为果糖，果糖既供白蚁利用，又是鞭毛虫的食物，白蚁和它肠内鞭毛虫的关系是      (    )

缺词填空 根据短文内容及首字母提示补全单词
    UNICEF works all over the world.
    UNICEF helps make the world a better place for c____ . We provide clean water, enough food and e____ for poor children in many countries.
    We want children to be healthy so we try to p____  illness. When they're sick, we pay for them to go to a doctor.We also think it's i____  that children go to school. Many children in p____  countries have to work to earn m____  for their families so they can't go to school.
    UNICEF raises money by s____ Christmas cards and organizing other fund-raising a____ .
    There are many w____  you can help UNICEF. You can send a donation or do some v____  work.