由甲、乙、丙三个粮仓，已知甲、乙两仓存粮之比是4：5，乙、丙两仓存粮之比是6：7

MCHC（　　）

A．80～100fl
B．80～90pg
C．27～34pg
D．320～360g/ml
E．320～360g/L红细胞平均指数的参考值分别是

气体在电弧高温下的分解，对提高焊缝质量是很有利的。

C

　　This summer vacation,Xiaokai,a high school student in Guangzhou,planned to spend his time surfing the Internet,playing basketball and watching TV.

　　But Xiaokai's parents tried to make him read some classics at home.In their yees,reading the classics would do his son much more good than other activities.

　　Though his room was full of the classic books,he had just finished reading one of them,The Old Man and the Sea.

　　"I picked up the book just because it was not very thick,"he said."Nothing impressed me at all after reading."

　　Xiaokai is not alone in today's China.Now most of the teenagers are fond of reading martial arts stories,cartoons and popular magazines.Theose classics cannot get them interested at all.

　　Parents areworrying about this phenomenon(现象).They always tell their chilren to read the classsics,which is supposed to help their children improve their academic studies.

　　Ms Li made a classics reading plan for her daughter,but her daughter refused to carry it away.She just finished less than 10 pages of the Dream of Red Chamber(阁楼) during the whole summer vacation. Ms Li sighed,"What's wrong with the children today?"

　　It is the same with teachers.One middle school Chinese teacher once prepared a chart(图表) of Interpersonal relationship in the best-known novel Dream of Red Chamber for his students. They were asked to remember how the characters are related to each other while preparing for the final exam.

　　To improve the situation in which the fastfood culture (快餐文化) seems to be winning over teenagers,parents are expected to understand their children's interests, and guide them to read the books instead of forcing them,according to some experts.It is not necessary for the kids to read the classics in their childhood.They can read classics after having their own life experience.

　　64.Xiaokai read only one classic book because _______.

　　A.he didn't have more

　　B.he wasn't interested in the classics

　　C.it took him a lot of time

　　D.he just acted on his parents' advice

　　65.When the writer says"Xiaokai is not alone",she means that ________.

　　A.many others don't like classics either

　　B.some parents and teachers support Xiaokai

　　C.Xiaokai is not the family's only child

　　D.Xiaokai often reads together with others

　　66.Which belong,or belongs,to the fastfood culture according to the article?

　　A.The old Man and the Sea.

　　B.The Dream of Red Chamber.

　　C.Martial arts stories.

　　D.The books filling up Xiaokai's room.

　　67.Who would be more likely to stand on the side of that Chinese teacher?

　　A.The students.    B.The parents.      C.The experts.     D.The writer.

高斯投影是一种等面积投影方式。（）

下列选项中，能引起外部中断的事件是( )。

A．键盘输入
B．除数为0
C．浮点运算下溢
D．访存缺页