-2009与x互为相反数，下列结论正确的是（） A．x=2009 B．x=1200

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问题选择题

-2009与x互为相反数，下列结论正确的是（　　）

A．x=2009

B．x=

2009

C．-2009x=1

D．

2009

=-1

答案

根据相反数的定义，得x=-（-2009）=2009．

故选A．

填空题

用所给动词的适当形式完成短文。

Grace often 1 (have) parties at home. She enjoys 2 (spend) time with friends. Yesterday

evening she 3 (invite) her friends to the party. They helped her 4 (do) all kinds of chores.

Some 5 (clean) the living room, the others 6 (make) dinner with her. They all had a good

time. Next week there 7 (be) another party at her home.

1. _____ 2. _____ 3. _____ 4. _____ 5. _____ 6. _____ 7. _____

单项选择题

腰穿后头痛的典型特点为（）。

A.伴恶心、呕吐

B.伴眩晕、视物倒转

C.畏光

D.直立时加重

E.平卧时加重