Drink water and milk often.Everyone __7__ (know) that water is important to us.Besides water, kids also need plenty of calcium, and milk is rich in calcium.If you are 9 years old or older, you should drink __8__ least three cups of milk every day.

　　It is also of great __9__ (important) to lead a healthy lifestyle.Limit the amount of time you spend watching TV and playing computer games.Spend more time doing sports, and you'll be healthy and __10__ (energy)．

　　语篇解读：本文为说明文。我们每个人都渴望健康，要想保持身体健康，我们需要吃好、定期锻炼，并养成良好的生活习惯。

　　1．To stay　To stay healthy是不定式短语作目的状语。

　　2．especially　especially表示"尤其"。

　　3．but　前后两句之间意义上存在转折关系，用but连接。

　　4．what　what our body needs是宾语从句。

　　5．eating　stop doing sth.表示"停止做某事"。

　　6．will become　这里指的是吃太多后将会发生的事，故用一般将来时。

　　7．knows　不定代词作主语时，谓语动词用单数。

　　8．at　at least表示"至少"。

　　9．importance　空格中所填单词在句中作介词of的宾语，且前面有形容词great修饰，需用important的名词形式。

　　10．energetic　空格中所填单词与前面的healthy相并列，因此该空需用energy的形容词形式。

第四节 短文改错

　　What a long winter vacation! I stay at home doing nothing except homework every day as a robot.One day, an idea occurred to me, "Why not to find a part­time job to learn something new？" The next morning, after visiting many shop, I was lucky enough to find one in small but pretty cake shop.When a tired­looking old man came in to buy a cake, I immediate helped him sat down in a chair and then brought him the cake.After he paid for them, I said thanks to him.He looked so happy that he praised me with a satisfying smile.From this, I learned："Be good to others or they will be good to you."

　　答案：第二句：stay→stayed; as→like

　　第三句：去掉第二个to

　　第四句：shop→shops; in后加a

　　第五句：immediate→immediately; sat→sit

　　第六句：them→it

　　第七句：satisfying→satisfied

第八句：or→and