用所给词的适当形式填空，每空一词。

1.  A cow has four _______ (stomach).

2.  Mr Black is very clean.  He brushes his _______ (tooth) three times a day.

3.  The boy washes his _______ (foot) once a week.  He is very dirty.

4.  The woman held (抱) her baby in her     _ (arm).

5.  Pigs have big _______ (ear).

6.  We see with our _______ (eye).

7.  She is very clean.  She washes her_______ (tooth) every evening.

8.  Boys, close your _______ (mouth) and listen to the teacher.

9.  If you have any questions, please put up your _______ (hand).

统计调查对象中，必须取得统计从业资格、持有统计从业资格证书的人员是（ ）。

A．法定代表人

B．统计负责人

C．会计人员

D．承担经常性政府统计调查任务的人员