影响涡流试验的试样的三个主要参数是（）.A.电导率、频率和材料几何形状； B.密度、

便条钟苗：在上届科技交易会期间，我公司签的一些意向书存在不规范之处。为此，公司准备在近期举办一期经济文书写作培训班，由相关人员专题讲授意向书的写作要领。请你提供一份意向书的结构样式及其写作方法的说明，明日交我审定。谢谢。

俗语说：“一个篱笆三个桩，一个好汉三个帮。”对此理解正确的是（    ）

A．个体只有依靠集体，才能有无穷的力量

B．个人的力量是微不足道的

C．集体需要个人为它作贡献

D．集体离不开个人

宋庆龄说：“孙中山和中 * * 党之间具有历史意义的合作不是偶然的，它是当时国际局势和中国本身的内部条件造成的。”这里所说的“内部条件”，最重要的是

A．一战后中国民族工业重新受到列强的压制

B．“打倒列强除军阀”成为全国人民的共同愿望

C．中共总结了经验教训正在积极寻求同盟者

D．国民党是中国各政党中比较革命的民主派

The simple act of surrendering a telephone number to a store clerk may seem innocuous—so much so that many consumers do it with no questions asked. Yet that one action can set in motion a cascade of silent events, as that data point is acquired, analyzed, categorized, stored and sold over and over again. Future attacks on your privacy may come from anywhere, from anyone with money to purchase that phone number you surrendered. If you doubt the multiplier effect, consider your e-mail inbox. If it’s loaded with spam, it’s undoubtedly because at some point in time you unknowingly surrendered your e-mail to the wrong Web site.

Do you think your telephone number or address are handled differently A cottage industry of small companies with names you’ve probably never heard of—like Acxiom or Merlin—buy and sell your personal information the way other commodities like corn or cattle futures are bartered. You may think your cell phone is unlisted, but if you’ve ever ordered a pizza, it might not be. Merlin is one of many commercial data brokers that advertises sale of unlisted phone numbers compiled from various sources—including pizza delivery companies. These unintended, unpredictable consequences that flow from simple actions make privacy issues difficult to grasp, and grapple with.

In a larger sense, privacy also is often cast as a tale of "Big Brother"—the government is watching you or a big corporation is watching you. But privacy issues don’t necessarily involve large faceless institutions: A spouse takes a casual glance at her husband’s Blackberry, a co-worker looks at e-mail over your shoulder or a friend glances at a cell phone text message from the next seat on the bus. While very little of this is news to anyone—people are now well aware there are video cameras and Internet cookies everywhere—there is abundant evidence that people live their lives ignorant of the monitoring, assuming a mythical level of privacy. People write e-mails and type instant messages they never expect anyone to see. Just ask Mark Foley or even Bill Gates, whose e-mails were a cornerstone of the Justice Department’s antitrust case against Microsoft.

And polls and studies have repeatedly shown that Americans are indifferent to privacy concerns. The general defense for such indifference is summed up a single phrase: "I have nothing to hide. " If you have nothing to hide, why shouldn’t the government be able to peek at your phone records, your wife see your e-mail or a company send you junk mail It’s a powerful argument, one that privacy advocates spend considerable time discussing and strategizing over.

It is hard to deny, however, that people behave different when they’re being watched. And it is also impossible to deny that Americans are now being watched more than at any time in history.

The email example shows（）

A. email has become the predominant means of communication

B. careless surrendering of personal information can be harmful

C. the communication via email is replacing that via telephone

D. email will become an area for potential attacks on privacy

认真阅读给定资料，试指出我国教育体制存在的主要问题。
要求：简明、准确，不超过150字。