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Tom and Fred are talking about the year 2020."What will our world be like in the year 2020?""I don't know."says Fred."What do you think?""Well, no one knows, but It's interesting to guess.""In the year 2020 everyone will carry a pocket computer. The computer will give people the answers to all their problems. We shall all have telephones in our pockets, too, and we'll be able to talk to our friends all over the world. Perhaps we'll be able to see them at the same time.""A lot of people will live and work under the sea. Perhaps there will be big towns, factories and farms under the sea, too.""Machines will do most of the work, and so people will have more holidays, perhaps they'll work only two or three days a week. They'll be able to fly to the moon by spaceship and spend their holidays there.""I'm looking forward(期待) to the year 2020. I hope to go to the moon!""And I hope I'll be able to live under the sea."says Fred."Won't that be very interesting? Just like a fish!"
【小题1】Tom and Fred talked about          
A.their school life
B.some interesting news
C.their life in the past
D.their life in the future
【小题2】Machines will          
A.do most of the work instead of people
B.do some of the work instead of people
C.do as much work as people
D.do as 1ittle work as people
【小题3】From their talk, we know that          
A.only Fred hopes to fly to the moon
B.both of them hope to fly to the moon
C.one of them hopes to fly to the moon
D.neither of them hopes to fly to the moon
【小题4】Fred said          
A.he liked fish very much
B.he would like to live under the sea like a fish
C.he would go fishing under the sea
D.he would spend a few days on the moon
【小题5】Which of the following statements is Not mentioned?
A.People will be able to fly to the moon in a spaceship.
B.People will have more holidays.
C.Many people will live and work under the sea.
D.All the factories and farms will be built under the sea.

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28、如图,矩形ABCD中,O是对角线AC的中点,延长AB到G,使BG=AB,连接GO并延长,交BC于E,交AD于F,且AC=2AB,连接AE、CF.求证:四边形AECF是菱形.

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(2012•绵阳)如图,正方形ABCD中,E、F分别是边AD、CD上的点,DE=CF,AF与BE相交于O,DG⊥AF,垂足为G.
(1)求证:AF⊥BE;
(2)试探究线段AO、BO、GO的长度之间的数量关系;
(3)若GO:CF=4:5,试确定E点的位置.

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如图,已知∠MON=45°,P是∠MON内的一点,点G、H分别是P点关于MO、NO的对称点,GH与OM,ON分别相交于点A,B.已知GH=5cm,则△PAB的周长是
5
5
 cm.若连接GO、HO,则△GHO是
等腰直角
等腰直角
三角形.

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如图,在半径为6,圆心角为90°的扇形OAB的
AB
上,有一个动点P,PH⊥OA,垂足为H,△OPH的重心精英家教网为G.
(1)当点P在
AB
上运动时,线段GO、GP、GH中,有无长度保持不变的线段?如果有,请指出这样的线段,并求出相应的长度;
(2)如果△PGH是直角三角形,试求OG:PG:HG的值;
(3)如果△PGH是等腰三角形,试求出线段PH的长.

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