user's face.But despite its popularity, experts warn that biometrics might not be as secure as we imagine. "Biometrics is ideally good in practice, not so much，" said John Michener, a biometrics expert.

　　When introducing the new iPhone's face ID feature, Phil Schiller, Apple's senior vice－president, said, "The chance that a random person in the population could look at your iPhone X and unlock it with his or her face is about one in a million." But it's already been done.In a video posted on a community website Reddit, two brothers showed how they were each able to unlock the same iPhone X using their own face.And they aren't even twins.

　　"We may expect too much from biometrics，" Anil Jain, a computer science professor at Michigan State University, told CBS News. "No security systems are perfect."

　　Earlier last year, Jain found a way to trick biometric security.Using a printed copy of a thumbprint, she was able to unlock a dead person's smartphone for the police, according to a tech website Splinter."It's good to see biometrics being used more，" Jain told CBS News, "because it adds another factor for security.But using multiple security measures is the best defense."

　　语篇导读　本文介绍了生物特征识别技术的最新发展情况，以及它们存在的安全问题。

　　5．Which is the latest identification technology in a smartphone according to the passage?

　　A．Face scanning.　 B．Eye scanning.

　　C．QR code scanning.　 D．Fingerprint scanning.

　　解析　A　细节理解题。根据第一、二段可知，生物特征识别技术比二维码更先进；再根据第三段可知，智能手机生物识别技术--指纹扫描、眼部扫描、面部扫描依次出现，因此面部扫描技术是智能手机的最新识别技术，故选A项。

　　6．What is a major problem of the iPhone X's face ID system?

　　A．It takes too long to unlock the phone.

　　B．It often fails to recognize its owner's face.

　　C．Face data can be used for other purposes.

　　D．Different faces can be used to unlock the same phone.

　　解析　D　推理判断题。根据倒数第三段中所举的例子In a video...they aren't even twins可知，人脸识别系统的一个主要问题是不同的脸可以解锁同一部手机，故选D项。

　　7．What is Anil Jain's opinion about biometric security?

　　A．It is as secure as traditional measures.

　　B．It is perfect without much improvement.

　　C．It has caused much trouble for the police.

　　D．It should be used with other security measures.

解析　D　观点态度题。根据倒数第二段及最后一段最后一句可知，Anil Jain认为没有哪项安全技术是完美的，生物特征识别技术应与其他安全措施一起使用，故选D项。