2．(2010哈尔滨)如图，在平面直角坐标系中，点O是坐标原点，四边形AOCB是梯形，AB∥OC，点A的坐标为(0，8)，点C的坐标为(10，0)，OB＝OC．

　 (1)求点B的坐标；

　 (2)点P从C点出发，沿线段CO以5个单位/秒的速度向终点O匀速运动，过点P作PH⊥OB，垂足为H，设△HBP的面积为S(S≠0)，点P的运动时间为t秒，求S与t之间的函数关系式(直接写出自变量t的取值范围)；

　　 (3)在(2)的条件下，过点P作PM∥CB交线段AB于点M，过点M作MR⊥OC，垂足为R，线段MR分别交直线PH、OB于点E、G，点F为线段PM的中点，连接EF，当t为何值时，？

　(2010台州市) 　 22．类比学习：一动点沿着数轴向右平移3个单位，再向左平移2个单位，相当于向右平移1个单位．用实数加法表示为 3+()=1．

　　 　若坐标平面上的点作如下平移：沿x轴方向平移的数量为a(向右为正，向左为负，平移个单位)，沿y轴方向平移的数量为b(向上为正，向下为负，平移个单位)，则把有序数对{a，b}叫做这一平移的“平移量”；“平移量”{a，b}与“平移量”{c，d}的加法运算法则为．

　 　解决问题：(1)计算：{3，1}+{1，2}；{1，2}+{3，1}．

　 (2)①动点P从坐标原点O出发，先按照“平移量”{3，1}平移到A，再按照“平移量”

{1，2}平移到B；若先把动点P按照“平移量”{1，2}平移到C，再按照“平移量”

{3，1}平移，最后的位置还是点B吗? 在图1中画出四边形OABC.

②证明四边形OABC是平行四边形.

(3)如图2，一艘船从码头O出发，先航行到湖心岛码头P(2，3)，再从码头P航行到码头Q(5，5)，最后回到出发点O. 请用“平移量”加法算式表示它的航行过程．

解：(1){3，1}+{1，2}={4，3}．　 ……………………………………………2分

{1，2}+{3，1}={4，3}． …………………………………………………………………2分

(2)①画图 …………………………………………………2分

　　 最后的位置仍是B．……………………………………1分

② 证明：由①知，A(3，1)，B(4，3)，C(1，2)

∴OC=AB==，OA=BC==，

　 ∴四边形OABC是平行四边形．…………………………3分

(3){2，3}+{3，2}+{-5，-5}={0, 0}．……………………2分

1．(2010哈尔滨)如图，在△ABC中，∠ACB＝90°，AC＝BC＝10，在△DCE中，

∠DCE＝90°，DC＝EC＝6，点D在线段AC上，点E在线段BC

的延长线上．将△DCE绕点C旋转60°得到△D′CE′(点D的

对应点为点D′，点E的对应点为点 E′)，连接AD′、BE′，

过点C作CN⊥ BE′，垂足为N，直线CN交线段AD′于点M，

则MN的长为　　　　　　　　　　 ．

There are many types of reports. A report is simply an account of something 1　 has happened. The commonest are news reports. We get them in newspapers, 　2　 the radio, and on television. The main purpose of a newspaper 　3　 (provide) news. If you examine a newspaper 4　 (close), you will find that there are all types of news: accident, floods, fires, wars, fashions, sports, books, etc. The news　 5　 (cover) everything that happens to people and their surroundings. Sometimes there　 6　 (be) news items which are very amusing. A news report is usually very short, except　 7　　 it is about something very important. It is also written in short paragraphs. The first paragraph is in fact　 8　 summary of the news item. The other paragraph give full details of the subject. There　 9　 (情态动词) also be interviews with people. Often there are photographs to 10　 (动词短语) the news to make it more interesting. 　_K^S*5U.C#O

10. He is said _____________(travel) around the country for 3 times.

9. A cook will be immediately fired if he is found ____________(smoke) in the kitchen.

8. So many people ______________(look) at her, she couldn’t speak out a single word.

7. His attention ______________(fix) his own research work, he did not even notice the loudly noise around him.

6. The criminal was about to tell the truth _______________ he was shot.

5.________________(accept) as a member of the company, he took over the job of the former secretary.

4. ________________(receive) her letter for a long time, I phoned her to see what was wrong.