历史学习要求结论要从史实中得出。下列各项结论与史实相符的一组是[ ]

数轴上与表示-2的点相距8个长度单位的点表示的数是______．

物业管理企业经理、部门经理、管理员实行持证上岗。《岗位合格证书》实行动态管理、复检制度。复检验证工作一般( )。

A．每年进行一次

B．每两年进行一次

C．每三年进行一次

D．每四年进行一次

句型转换。

1. My father watches TV on Saturday evening. (改为一般疑问句, 并否定回答) 

    ______ your father ______ TV on Saturday evening?

    No, ______ ______.

2. Simon does his homework in his bedroom every night. (改为否定句)

    Simon ______ ______ his homework in his bedroom every night.

3. It takes Millie about an hour to play badminton every day. (写出同义句)

    Millie ______ about an hour ______ badminton every day.

4. He's very good at Maths. (写出同义句)

    He ___________________________ Maths.

5. They practice swimming after class every Tuesday. (对画线线部分提问)

    ___________________ they _______ after class every Tuesday?

有两包白色粉末，分别是K₂CO₃和NaHCO₃，请你写出2种不同的鉴别方法．

（1）______

（2）______．

在Visual FoxPro中，下面4个关于日期和日期时间的表达式中，错误的是

A．{^2002.09.01 11:10:10AM}-{^2001.09.01 11:10:10AM}

B．{^01/01/2002}+20

C．{^2002.02.01}+{^2001.02.01}

D．{^2002/02/01}-{^2001/02/01}