铁素体的性能与纯铁相似，它具有良好的塑性和韧性，但强度和硬度较低。

_______ his being late again , he lost his job and had to stay at home.

A．Owe to

B．As result of

C．In case of

D．Because of

下述疾病中，最不容易引起角膜带状变性的是（）

A.病毒性角膜炎

B.闭角性青光眼

C.虹膜睫状体炎

D.视网膜脱离

E.老年性白内障

阅读表达。

     阅读下面的短文，并根据文章后的题目要求回答1-5小题。

     [1]There are many different types of volunteer (志愿者) options (选择) for teens, and you will no

doubt find more than this article can possibly list. But here are a few ideas to get you started on the path

to being a successful volunteer. 

     [2] Red Cross programs and many blood banks (血库) need teen volunteers. In fact the Red Cross

has an entire Junior Red Cross that is devoted to offering volunteers jobs to teens. You will have the

chance to  help others directly and do various jobs.

     [3] Parks and recreation (休闲,消遣) centers often run camps that are mostly worked by teens. If

you enjoy working with children and you' re considering a career in teaching, look up day camps that

offer these volunteer options to teens. Teens may volunteer for a year or two and then qualify for paid

position as instructors.

     [4] Libraries are always in need of extra hands, especially during summer when more children are at

the library. Volunteers can shelve books, read stories to children, help supervise (管理) sections of a

library, or learn how to check out books for people. If you have ______, you can provide extra help

by working with people to surf the Internet on library computers.

     [5] Animal shelters give teens a chance to have direct contact with animals. You may have to do

some clean-up work for animals, but you also have a chance to decide whether a career working with

them is right for you.

     [6]Lastly, teens who want to volunteer but don't have much time to spend on volunteer activities can

look for one-time activities that can also help. For example, you can volunteer to work at your school or

church's festival or yard sale, which may take up a few hours of one day but won't require a commitment

beyond that.  

1. What is the main idea of the passage? (no more than 10 words))

____________________________________    _______________________  

2. Fill in the blank in Paragraph 4 with proper words.(no more than 2 words)

_______________________________________________________________

3. Complete the following statement with words from paragraph 2 (no more than2 words)

   Volunteers in Red Cross programs can help others directly and do___________

4.  What can teens who want to volunteer but don't have much time to? (no more than 5 words)

________________________________________________________________

5. What does the word "them" (Line 2, Paragraph 5) probably refer to? (no more than 2 words)

________________________________________________________________

盛装水样的贮样容器在装箱时，同一采样点样品应装在（）包装箱内。

A、同一

B、两个

C、三个

D、四个

男性，28岁吸烟患者，因低热、咳嗽2月，痰中带血1周来院门诊。查体：T37．5°C，双侧颈后可触及多个可活动之淋巴结，右上肺可闻及支气管肺泡音。胸片示右上肺云雾状阴影。最可能的诊断是

A．原发型肺结核

B．血播型肺结核

C．浸润型肺结核

D．支气管肺癌

E．慢性纤维空洞型肺结核