在下面式子中的○里填入适当的运算符号。（1）[50.8-（30+5.6○0.4）

阅读理解。

     Tim Richter and his wife, Linda, had taught for over 30 years near Buffalo, New York-he

in computers, she in special education."Teaching means everything to us." Tim would say.In

April 1998, he learned he would need a heart operation.It was the kind of news that leads to

some serious thinking about life's purpose.

     Not long after the surgery, Tim saw a brochure describing Imagination Library, a program

started by Dolly Parton's foundation (基金会) that mailed a book every month to children

from birth to age five in the singer's hometown of Sevier, Tennessee."I thought, maybe Linda

and I could do something like this when we retire." Tim recalls.He placed the brochure on

his desk as a reminder.

Five years later, now retired and with that brochure still on the desk, Tim clicked on

imaginationlibrary.com.The program had been opened up to partners who could take

advantage of book and postage discounts.

     The quality of the books was of great concern to the Richters.Rather than sign up

online, they went to Dollywood for a looksee."We didn't want to give the children rubbish."

says Linda.The books-reviewed each year by teachers, literacy specialists, and Dollywood

board members-included classics such as Ezra Jack Keats's The Snowy Day and newer

books like Anna Dewdney's Llama Llama series.

     Satisfied, the couple set up the Richter Family Foundation and got to work.Since 2004,

they have shipped more than 12,200 books to preschoolers in their area.Megan Williams,

a mother of four, is more than appreciative:"This program introduces us to books I've

never heard of."

     The Richters spend about $400 a month sending books to 200 children."Some people

sit there and wait to die." says Tim."Others get as busy as they can in the time they have left."

1．What led Tim to think seriously about the meaning of life?

A．His health problem.

B．His love for teaching.

C．The influence of his wife.

D．The news from the Web.

2．What did Tim want to do after learning about Imagination Library?

A．Give out brochures.

B．Do something similar.

C．Write books for children.

D．Retire from being a teacher.

3．According to the text, Dolly Parton is ________.

A．a wellknown surgeon

B．a mother of a fouryearold

C．a singer born in Tennessee

D．a computer programmer

4．Why did the Richters go to Dollywood?

A．To avoid signing up online.

B．To meet Dollywood board members.

C．To make sure the books were the newest.

D．To see if the books were of good quality.

在旧道面加铺沥青混凝土面层的不停航施工过程中，安排每日加铺工作时，必须考虑()所占用时间。

A.处理临时接坡

B.沥青混凝土硬化

C.喷撒粘层油

D.沥青混凝土冷却

有自语自笑，5天前开始终日卧床，不吃饭，不知上厕所。入院后卧床，不动不语，针刺其身体无反应。肌张力增高。令患者张嘴，反把嘴闭得更紧，把患者肢体摆成不舒服的姿势，可以保持很久不变，躯体及神经系统检查未见其他异常体征。

该患者的诊断最可能是（）

A.抑郁发作

B.散发性脑炎

C.分裂样人格障碍

D.分离-转换障碍

E.精神分裂症

简述西安事变和平解决的主要条件。

本质安全是指设备、设施或技术工艺含有内在的能够从根本上防止发生事故的功能。具体包括（）。

A.失误——安全功能

B.技术——安全功能

C.规划——安全功能

D.设备——安全功能

E.故障——安全功能