1．April 22 is Earth Day.Everyone on earth should care about and protect the earth!The earth has warmed by about 1°F （華 氏度） over the past 100 years，but why and how？Well，scientists are not quite sure.Maybe the earth gets warmer and warmer on its own.But many scientists say that people are doing many things which makes the earth warmer .
   First，greenhouse effect （溫室效應(yīng)） is a very important reason for the change of the earth.People give out too much energy into the air every year.It makes the earth warmer.Climate （氣候） change is another important reason.Sometimes it becomes too hot and sometimes too cold.Sometimes there is too much rain and sometimes too little.The change of the climate makes the earth warmer.In turn，the warmth of the earth changes the climate，too.
   When the earth becomes warmer.there may be more rain and a rise in sea level.It will affect the growth of plants，animals and people.On a Pacific island，100 people have to move to higher ground because the sea is rising.These people can no longer live on the coast.Before that，two islands without people went underwater in 1999.Scientists say that the seas can rise by nearly one meter by 2100.
   People can affect the earth's air，land and water.As for us，we can do many things to protect the earth.For example，we can use fridges less.We can tell more people about protecting the earth.

（1）Earth Day is probably set for people to .
A．learn more about the earth
B．make full use of the earth
C．take better care of the earth
D．study the warmth of the earth
（2）We can infer （推斷） from the passage that the reasons for the warmer earth are now.
A．not very clear
B．completely secret
C．well known
D．not given yet
（3）Greenhouse effect comes from .
A．sea rising
B．climate change
C．nature's unbalance
D．people's activity
（4）According to the passage， may affect each other.
A．a(chǎn)nimals and islands
B．climate and the warmth of the earth
C．fridges and animals
D．sea level and the growth of plants
（5）The passage mainly tells us that .
A．there is more rain now
B．we should protect the earth
C．we must stop pollution
D．sea level is getting higher

2．A healthy eating habit along with enough exercise can help you keep healthy．When you are young，it is important to give your body what it needs．If you skip meals，you can't get enough calories（ 卡路里 ）．And then you may feel tired．By the way，the calorie is just another word for energy．About 50% of your calories should come from rice，bread，vegetables and fruit．You also need to drink a lot of water，six to eight glasses a day．Drinking enough water can make your body work better and make you healthy．
   Exercise can help to make you look good，feel good and be healthy．Scientists say that kids should spend at least 30 minutes exercising a day，five times a week．It is easy to do!You can walk or ride your bike to school，and play sports at school．However，kids often give up sports，saying they have no time left after finishing their homework．In fact，doing exercise can help them sleep better and do better in their lessons．
   If you follow the advice above，you will look and feel much better and become healthy．

（1）The underlined word "skip" in Paragraph 1 means " " in Chinese．
A．詢問
B．略過
C．阻止
D．轉(zhuǎn)移
（2）According to the scientists，kids should spend at least minutes exercising every week．
A．30
B．50
C．100
D．150
（3）Why do many kids give up sports according to the passage？
A．Because they are too lazy to exercise．
B．Because they feel great after giving up sports．
C．Because they are busy with their studies．
D．Because they don't like playing sports at all．
（4）What's the main idea of this passage？
A．How to eat healthily．
B．How to exercise．
C．How to look thinner．
D．How to keep healthy．

3．Did you see a dentist before？Taking care of your teeth is necessary.And it's important to have healthy teeth.They can help you speak clearly（清楚地）.Do you want to have healthy teeth？
   Follow my suggestions.
   It's not enough to brush your teeth only once a day.Brush your teeth at once after each meal.Food debris（殘?jiān)?can make your teeth ill slowly.And you should brush all of your teeth，not just the front ones.Spend some time on the teeth along the sides.Take your time while you are brushing.
   Spend at least three minutes each time when you brush.
   Eat fewer candies or other sweet food.Lots of fruit and vegetables can make your teeth strong.Drink more water instead of drinks such as coffee and Coke.
   Go to see a dentist and ask him to check your teeth once a year.He can find out your problem before it becomes too serious.
   If you follow these suggestions，you'll have white and healthy teeth.

（1）From this passage，when do we need to brush teeth？
A．Before each meal.
B．After each meal.
C．Before sleeping.
D．After getting up.
（2）How long should we brush teeth each time？
A．At least one minute.
B．At least two minutes.
C．At least three minutes.
D．At least four minutes.
（3）What can make teeth strong？
A．Fruit and sweet food.
B．Coffee and vegetables.
C．Fruit and vegetables.
D．Sweet food and vegetables.
（4）How often should we go to see a dentist？
A．Once a month.
B．Three times a year.
C．Twice a year.
D．Once a year.
（5）Which can be the best tile for this passage？
A．How to Have Healthy Teeth
B．How to Have Healthy Food
C．How to Brush Teeth
D．How to See the Dentist