听写填空实战演练
2009年北大考题
I．Biometric devices
A．Function:used to C1 and C2 C3
B．Working procedure
1．Reading a C4 signal(e.g.the C5 of a person’s voice,the C6 of a person’s hand,or the design of C7 C8 in a person’s eyes)
2．Opening the door if the signal is C9.
II．Disadvantages and biometric devices
A．They are C10;some cost as much as C11(dollars)
B．None of the devices works C12
III．Advantages of biometric devices
A．They make C13 or C14 C15 C16 unnecessary
B．C17 biometric computers is faster
C．Each computer can read C18 of signals
D．C19 the computer with a C20 signal is difficult
答案解析
I．Biometric devices
（1）lock （2）unlock （3）doors
从录音中的“Biometric devices use computers to lock and unlock doors.”可知，应该填入lock、unlock、doors。
（4）physical （5）sound （6）shape （7）blood （8）vessels(https://www.daowen.com)
从录音中的“For example,the signal can be the sound of a person’s voice or the shape of his or her hand.A person gives the signal to the device,he or she may say his/her name aloud or they may place their hand on it,the device reads the signal if it is correct,the device opens the door and permits the person to enter.”可填出5和6，并由5和6归纳得出这是人体的physical（身体）特征。从7和8后面的eyes可听到录音中的“…one of the latest systems works by examining the design of blood vessels in a person’s eye.”，由此可知7和8的答案。
（9）correct
从录音中的“…the device reads the signal.If it is correct,the device opens the door and permits the person to enter”可知，该空填入correct。
II．Disadvantages and biometric devices
（10）costly （11）6,000
根据录音中的“Biometric security systems are costly.Some cost as much as 6,000 for each lock.”可完成这两个空。
（12）perfectly
从录音中的“Newer devices work better.But none work perfectly.”可知，正确答案为perfectly。
III．Advantages of biometric devices
（13）keys （14）plastic （15）security （16）cards
从录音中的“Biometric technology makes keys or plastic security cards unnecessary.”可知正确答案。
（17）Programming
从录音中的“Programming biometric computers is faster.”可知正确答案。
（18）thousands
从录音中的“Each computer can read thousands of signals.”可知正确答案。
（19）Fooling （20）false
从录音中的“Fooling the computer with a false signal is difficult.Experts think biometrics will become much more common,but they say it will take time.”可知正确答案。
听力原文
A new computer technology may make locks,keys and security cards unnecessary.The technology is caIled biometrics.Biometric devices use computers to lock and unlock doors. They permit people to use a physical signaI instead of a key.For example,the signal can be the sound of a person’s voice or the shape of his or her hand.A person gives the signal to the device;he or she may say his/her name aloud or they may place their hand on it;the device reads the signal.If it is correct,the device opens the door and permits the person to enter.Biometric technology is not completely new.Some devices were developed in the late 1970s.Today more than 20 factories in the United States make the devices.There are also many kinds to choose from.One of the latest systems works by examining the design of blood vessels in a person’s eye.Biometric security systems are costly.Some cost as much as 6,000 for each lock.Newer devices work better.But none work perfectly.Usually the only businesses that use biometrics are those that need very tight security,for example, some government offices and military buildings in the United States now have biometric door controls.Few private home owners use them because of the cost.Experts think the number will increase as the price goes down.Biometric technology makes keys or plastic security cards unnecessary.Keys and cards can be lost or stolen.Replacing them or changing locks takes time and money.Programming biometric computers is faster.Each computer can read thousands of signals.Fooling the computer with a faIse signal is difficult.Experts think biometrics will become much more common,but they say it wilI take time.