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．

This is a picture .There is a lake (湖)in the middle of the picture .On the lake we can see a boat .In the boat, there is a boy and his father .The boy is fishing .His father is looking at him .We can see some fish swimming in the lake .On the right of the picture , we can see a big tree .A young woman is reading a book .Her name is Mary .We can see very nice flowers near her seat .A little yellow dog is beside her feet .There are some birds in the sky .On the other side of the lake ,we can see three children .They are laughing and flying kites .They are having fun.
【小题1】This is a picture of _____.

A．A park

B．Mary’s family

C．a school

D．a restaurant

【小题2】Mary is ______.

A．looking at her son

B．reading a book

C．swimming in the lake

D．flying a kite

【小题3】The little dog is ____.

A．blue

B．yellow

C．black

D．brown

【小题4】There are _____people in the picture .

A．2

B．4

C．6

D．8

【小题5】Are they having a great time ?

A．No, they haven’t .

B．No, they aren’t .

C．Yes , they have .

D．Yes , they are .

A、CM=DN

B、CH=HD

C、OH⊥CD

D、 EC OH = OH FD

如图，在△ABC中，∠ACB=90°，AC=BC=2，M是边AC的中点，CH⊥BM于H．
（1）试求sin∠MCH的值；
（2）求证：∠ABM=∠CAH；
（3）若D是边AB上的点，且使△AHD为等腰三角形，请直接写出AD的长为．