As data and identity theft becomes more and more common，

As data and identity theft becomes more and more common，the market is growing for biometric(生物测量) technologies—like fingerprint scans—to keep others out of private e－spaces.At present，these technologies are still expensive，though.
Researchers from Georgia Tech say that they have come up with a low－cost device(装置) that gets around this problem：a smart keyboard.This smart keyboard precisely measures the cadence(节奏) with which one types and the pressure fingers apply to each key.The keyboard could offer a strong layer of security by analyzing things like the force of a user's typing and the time between key presses.These patterns are unique to each person.Thus，the keyboard can determine people's identities，and by extension，whether they should be given access to the computer it's connected to—regardless of whether someone gets the password right.
It also doesn't require a new type of technology that people aren't already familiar with.Everybody uses a keyboard and everybody types differently.
In a study describing the technology, the researchers had 100 volunteers type the word “touch” four times using the smart keyboard.Data collected from the device could be used to recognize different participants based on how they typed，with very low error rates.The researchers say that the keyboard should be pretty straightforward to commercialize and is mostly made of inexpensive，plastic－like parts.The team hopes to make it to market in the near future.
文章大意：主题：人与社会(科学与技术)；话题：智能键盘。本文是一篇科研报道。来自佐治亚理工学院的研究人员发明了一种智能键盘，可以通过分析用户的打字模式来判断该用户是不是安全访客。
1．Why do the researchers develop the smart keyboard？_D__
A．To reduce pressure on keys.
B．To improve accuracy in typing.
C．To replace the password system.
D．To cut the cost of e－space protection.
解析：推理判断题。根据第二段第一句“Researchers from Georgia Tech say that they have come up with a low－cost device that gets around this problem: a smart keyboard.”以及第一段最后一句“At present，these technologies are still expensive，though.”可推知，研究者研发这种智能键盘是为了降低网络安全保护技术的成本。注意题干、正确选项以及原文中一些词汇的多次呼应现象：develop与come up with是同义词，expensive与low－cost是反义词，cut the cost与low－cost相呼应。
2．What makes the invention of the smart keyboard possible？_C__
A．Computers are much easier to operate.
B．Fingerprint scanning techniques develop fast.
C．Typing patterns vary from person to person.
D．Data security measures are guaranteed.
解析：推理判断题。题干问的是“是什么让智能键盘的发明成为可能”，也就是问这一发明的核心依据是什么。根据第二段中的“These patterns are unique to each person.Thus，the keyboard can determine people's identities...”可知，正是因为每个人的打字模式不同，这种智能键盘就可以通过分析用户的打字力度及节奏等来判断该用户是不是安全访客，故C项符合题意。解答该题的关键是看懂题干的意思，即智能键盘的核心依据是什么。
3．What do the researchers expect of the smart keyboard？_B__