问题 单项选择题

只允许操作系统使用而不允许一般用户使用的指令是

A.系统指令

B.特权指令

C.非特权指令

D.算术运算指令

答案

参考答案:B

解析:[命题目的] 本题主要考查了操作系统的基本知识。[解题要点] 只允许操作系统使用而不允许一般用户使用的指令是特权指令;特权指令之外的指令称做非特权指令。[考点链接] 掌握特权指令和非特权指令的一些具体指令,比如设置时钟、清内存、算术运算指令等。

阅读理解

  Kristy,28,a cook in La Gross, often wondered what she’d do in a life threatening situation. On August 29, she got her answer. While she was driving on a road,a big truck hit its head on a pickup car.The pickup burst into flames.Kristy rushed out and ran to the pickup.Two farmers,Dean Bernhard,51, and his brother,Donald,44,were inside.

When she got close,Kristy could see the unconscious driver.The other man was under the passenger seat. “The smells were sicking.I was afraid the truck would blow up and kill us all,” said kristy.

The driver of the big truck was struggling to open the passenger door,so Kristy rushed to the driver’s side.Finally they opened the door.She reached in,seized the driver and, to her horror,felt her hands sink into his chest.She quickly dragged the man to safety on the roadside,then hurried back.As Kristy started down the ditch(水沟) with the passenger,the pickup exploded..She jumped on top of him and they both rolled to safety.

Today,the two farmers,each the farmer of two children,are good friends with Kristy.To show their deep appreciation,they bought her a ring with nine diamonds---one for each member of their immediate families,and the ninth for her.

小题1:Which is the correct order according to the passage?

a.carried Dean and Donald to safety

b.rushed to the pickup

c.the pickup exploded

d.saw the truck hit on the pickup

e.got out of her car

f.wondered what she’d do when in danger

A.e,d,b,a,c,f

B.f,e,b,a,d,c

C.f,d,e,b,a,c

D.f,c,e,d,b,a小题2:When coming to save Donald and Dean Bernhard,Kristy never thought that she___.

A.could have any help from others

B.would be successful in saving both of them

C.might be killed

D.would be tested in dangerous situations小题3:This sentence “The pickup burst into flames.”in the first paragragh means “_______”.

A.The pickup was on fire

B.The pickup started smoking badly

C.A terrifying cry came out of the pickup

D.The pickup was broken into pieces小题4:Which of the following best shows Kristy’s true heroism?

A.She did not feel terrified at the accident

B.She protected herself as well as the two brothers from harm.

C.She put her life “on the line” to save others.

D.She was regarded as a member of Dean’s and Donald’s families.

填空题