How to Look After a Computer

Many young people use computers, but few of them know how to look after them. Remember the following when you use your computer.

1．    Keep your computer in a cool, dry room.    71   Most computers work best at a temperature of 5℃-30℃.

2．        72    Smoke of all kinds is very bad for many parts of a computer and can cause many problems.

3．        73     Pieces of food and a little water in the keyboard can also cause many problems.

4．    Make sure that the keyboard and screen are at the correct height for you.

        74    

5．    Make sure the screen（屏幕）is the correct distance (距离) from your eyes. If you wear glasses, make sure these glasses are correct for using the computer.     75  

6．    Keep your screen clean and don’t make it too bright. A dirty or a very bright screen can hurt your eyes.

在方框中选择恰当的句子补全以上短文，将序号填在相应的横线上。（5分）

71._______ 72._______ 73._______ 74._______ 75._______

Julio loves to visit his grandmother . He doesn’t get to visit her very often because his family lives in a city that is six hours away .His grandmother lives in a big wooden house on a farm .It is old and looks as if it has secret hiding places .
On the third Sunday of June ,Julio’s parents took him to his grandmother’s .Since it was summer vacation, he was going to stay at grandmother’s for a whole summer . Hid cousins Mario and linda would soon be arriving. They would also be staying at their grandmother’s this summer .
A big porch (走廊) wrapped （缠绕）around two sides of the house .Julio sat in the porch swing （秋千）.He could see the trees that circle the house .They had been planted as a windbreak （防风林）.They protected the house from the wind and blowing dirt .The house was in the middle of a large flat field .
Julio watched the dirt road that led to the house .He couldn’t wait for his cousins to get there .Mario was his age ,and Linda was a year younger .They had fun together .Last summer they spent one whole morning making a fort out of sacks of seed （装种子的麻袋做成的堡垒）.Then Uncle Henry took them on a tractor ride.
Julio remembered another time with his cousins .They had gone out to explore the fields .Julio touched an electric fence and got a shock .Then they found an old snake skin. Nothing like that ever happened at his own home !
Julio could smell the dinner that his grandmother was cooking .It made him hungry .
Finally he saw a cloud of dust coming up the road .“They’re here ! They are here !”He shouted .
根据材料内容选择最佳答案。并将其标号填入题前括号内。
【小题1】Why doesn’t Julio often visit his grandmother ?