Althoughmanypeoplereadonline，b-优题课

Nick gave his mother a scarf on her　　birthday． That made her very happy．（ forty ）

﹣Let's go swimming in the river this afternoon．

﹣We'd better not． It's　　．（ danger）

Great changes have taken place in　　hometown．（ we ）

Our earth is in trouble． Our drinking water is becoming dirtier and the air is not as clean as before． People and factories are polluting the air， rivers， lakes and seas． You may think there is nothing you can do to help． That's not true．（1）　　

Cars burn oil．（2）　　Some people believe that too much CO2 is making the earth warmer than ever．（3）　　This can save some oil and produce less CO2．

（4）　　So turn off the air conditioner（空调） when you don't need to use it． Use lights that save energy． Use fewer things that cannot be used again． When you buy something． consider those made from things that can be used again first．

A lot of water is needed for a shower． So take shorter showers．（5）　　

Every small action can make a big difference to our earth． Let's take action to protect it

A． This can cut the use of water．

B． Air pollution is very serious．

C． This will make a lot of CO2 into the air．

D． So try to walk， ride a bike or take a bus．

E． Nobody can play a role in protecting the earth．

F． There are many things you can do to save the earth．

G． The biggest energy use a home is for keeping warm or cool．

When I was in Grade 5， I had a fight with a boy named Tony in my class． I have forgotten what the fight was about， but I have never forgotten the（1）　　I learned that day．

I thought that I was right and he was wrong﹣ and Tony just thought that I was wrong and he was right．The teacher， Mrs． Green， decided to teach us a very（2）　　lesson．

Mrs． Green asked us to stand on each side of her desk． In the middle of her desk was a large，round object． I could（3）　　see that it was black． She asked Tony what（4）　　the object was． "White，" Tony answered． I couldn't（5）　　Tony said the object was white， when it was black! Another fight started（6）　　us， this time about the color of the object．

The teacher told me to go and stand where Tony was standing and told him to come and stand where I had been．（7）　　 changed places， and now she asked me what the color of the object was， I had to answer，" （8）　　 "It was an object with（9）　　 differently colored sides． From Tony's side it was white，（10）　　 from my side it was black．

（1）A． fight	B． lesson	C． teacher	D． classmate
（2）A． difficult	B． boring	C． safe	D． important
（3）A． loudly	B． widely	C． clearly	D． heavily
（4）A． color	B． size	C． shape	D． time
（5）A． decide	B． believe	C． doubt	D． promise
（6）A． under	B． behind	C． between	D． beside
（7）A． She	B．He	C． They	D． We
（8）A． White	B． Black	C． Brown	D． Purple
（9）A． one	B． two	C． three	D． four
（10）A． or	B． nor	C． but	D． since