当土为超固结状态时，其先期固结压力pc与目前上覆土层的自重应力p0之间的大小关系为_

They would not allow him _______   across the enemy line.  

A．to risk going

B．risking to going

C．for risk to go

D．risk going

经纬网的主要作用是（　　）

A．确定海拔高度

B．确定地点位置

C．确定资源分布

D．确定人口分布

药物信息按照其最初来源通常分为三级，即以期刊发表的原创性论著为主的一级信息源、引文和摘要服务为主的二级信息源以及参考书和数据库为主的三级信息源。下述评价三级信息的标准中，不正确的是（）

A.所提供的内容是否最新

B.作者是否为该领域的专家

C.是否还提供相关信息的引文或连接

D.提供的信息内容有无偏倚或明显的差错

E.评价重点是其中的"研究对象"和"研究方法"

阅读下面的短文，并根据短文后的要求答题。（请注意问题后的词数要求）

For career advancement or just for fun, thousands are going back to school online.

In our age of rapid change, big rewards go to those who possess cutting-edge knowledge. Employers and customers look for people who can successfully negotiate the opportunities around us.

From being able to skillfully operate leading software programs, to web development, to improving personal skills; thousands are sharpening their minds and careers with exciting courses on the Internet.

Internet-based, online courses give you a number of convenient advantages. With nothing more than an online connection and a browser（浏览器）you can logon and enjoy one of thousands of study programs via web pages and email. There are never any commuting or parking hassles（匆忙）. Multimedia online courses also make learning easy and fun!

Because virtual schools on the Net don’t require a campus, full-time staff, or a football team, Internet-based courses are far cheaper than traditional classroom courses. You can learn at your own pace, doing assignments and communicating with instructors and fellow learners whenever you have time.

Before you enroll, check to see if your employer or business requires a specific kind of knowledge. You can pursue online study towards skills that you require on the job. If your goal is strictly self-improvement, look for a course that focuses on developing skills you can enjoy and use. You have your own choice.                               . It costs a lot, takes too much time, or has little to do with your life.

If it has been long time since you took a class, you will probably find the rewards of study have improved. Adults with rich work and life experience have a wealth of knowledge they can use to add depth and meaning to their studies. You often find things you can quickly learn in an internet course give you new insight into experiences at work.

小题1:What is talked about in the passage? (within 10 words)

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小题2:Fill in the blank in Paragraph 6 with a proper sentence. (within 15 words)

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小题3:Which sentence in the passage is the closest in meaning to the following one?

You can learn at whatever speed that suits you, do your homework and communicate with your teachers and fellow learners no matter when you have time.

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小题4:What is one disadvantage of online study in your opinion? (within 30 words)

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内封式堵漏袋由防腐橡胶制成，工作压力大约为（）Mpa。

A.1

B.0.5

C.0.15

D.0.25