一个完整的信息安全保障体系，应当包括（）五个主要环节，这就是PPDRR模型的内容。

阅读理解。

　　It is Sunday today. Tom is lying in bed. It is eight-thirty. He doesn't want to

get up.  His father is watering the flowers(浇花).  His mother is cooking

breakfast. His sister is doing her homework.

　　"Get up,  Tom. "  says his mother,  " Go to help your dad. " Tom  has to

leave the bed, but he finds a math book in his bag. He stdrts to read loudly. "

Three times (乘)  five is fifte.en,  three times six is six-teen. . . " His mother

hears this and  becomes  angry (生气).   She  asks," What are you reading,

Tom?"  "I don't know. "  " Aren't you reading?"" Yes,  I am, " answers the boy.

" But I am not listening ! "

1. There are _____ people in Tom's family.

A. two      

B. three      

C. four          

D．five

2. The family are all busy except(除…以外_____.

A. Tom      

B. Tom's si    

C. Tom's father      

D. Tom's mother

3. Tom doesn't want to get up because          .

A. it is very early              

B. he is very tired

C. he has no homework            

D. he doesn't need to go to school

4. _____, so he begins to read the book.

A. Tom doesn't want to get up to help his father

B. Tom doesn't want to help anyone

C. Tom likes reading very much

D. Tom likes to study math very much

5. Tom's mother is angry because _____.

A. her son doesn't go to help his father

B. what her son is reading is not right

C. her son is reading a math book

D. her son doesn't listen to her

根据诚实信用原则，当事人在履行合同时，应积极履行（）。

A.保密义务

B.协助履行义务

C.付款义务

D.通知义务

E.担保义务

脚手架的外测、斜道和平台防护栏杆的搭设有什么要求？

抢救肝硬化所致消化道出血、出血性休克的患者中，下列哪项措施是错误的（）

A.建立静脉通道

B.烦躁者给予吗啡或巴比妥类药物

C.积极补充血容量

D.保持呼吸道通畅

E.监测生命体征变化

纳税人被吊销营业执照的，应当自执照被吊销之日起( )日内，办理注销登记。

A．10

B．15

C．30

D．60