We will pay a visit to the old people's home this Sunday．
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任务型阅读。
①After Pluto(冥王星)was found in 1930,people took it as the ninth planet in our solar system(太阳系)．But it isn't like other planets．It is smaller and has a strange orbit(轨道)．On August 24,scientists said,“Pluto is not a plane．”
About 2,500 scientists met in Prague．At first,some of them said that there would be 12 planets in our solar system．In the end,the scientists said that only Mercury,Venus,Earth,Mars Jupiter,Saturn,Uranus and Neptune are the planets in the solar system．②Each of these planets has its own orbit,and each of the planets is big enough to be a planet．Pluto's orbit overlaps(交叠)Neptune's and it is smaller than the other planets．③So Pluto is classified(分类)as a dwarf planet(矮行星),but no longer a planet in the solar system．
Students at school will have new schoolbooks to learn the new solar system!
l．根据①处完成下面的句子。(每空一词)
Before people ________ Pluto in 1930,there were ________ planets in our solar system．
2．根据②处完成下面的句子。(每空一词)
Every planet not only has its own ________,but also is ________ enough．
3．将③处译成汉语。________
从方框内选择合适的选项补全短文。
It's important to learn how we can protect the environment．Here are 5R rules for us．
Reduce：If you want to reduce waste,you should use things more wisely． 1 If everyone uses paper carelessly,soon we would not have any trees left．Other things are also being wasted,and people don't know what to do with the waste in big cities．So it is necessary to reduce the amount of waste we produce．
Reuse：You should always think of reusing things before throwing them out．For example, 2 In a family,you may pass on such clothes to younger brothers or sisters．
Recycle：Bottles,cans and paper can easily be recycled．By doing so,we save lots of time and money．For example, 3 The metal can be used to make new Coke cans．
Recover：When you buy a box of apples,there may be a few rotten ones．You have two choices：One is to throw the apples away;the second is to throw the rotten ones and keep the good ones．In this way,you are recovering the eatable parts of food．
Repair：If one of the legs of your table is broken,you should repair it．If you want to buy something newer and better,it is better for you to sell the old table,or 4 ．
Learn the rules to protect our environment．Let's try our best to make the earth cleaner and more beautiful．
