单选题 In computing, passwords are commonly used to limit access to official users. Yet the widespread use of passwords has serious drawbacks. Office workers now have to remember an average of twelve system passwords. In theory they should use different passwords for each site, but in reality these would be impossible to remember, so many people use the same password for all.
An additional problem is that the majority use simple words such as "hello", or names of family members, instead of more secure combinations of numbers and letters, such as 6ANV76Y. This permits computer hackers to download dictionaries and quickly find the word that allows them access.
When system users forget their passwords there is extra expense in supplying new ones, while if people are forced to change passwords frequently they often write them down, making systems even less secure. Therefore, it is clear that the idea of passwords which have been used as security devices for thousands of years, may need rethinking.
One possible alternative has been developed by the American firm Real User, and is called "Passfaces". In order to access the system a worker has to select a series of photographs of faces from a randomly(随机的) generated sequence. If the pictures are selected in the correct order, access is granted. This concept depends on the human ability to recognize and remember a huge number of different faces, and the advantage is that such a sequence cannot be told to anyone or written down, so is more secure. It is claimed that the picture sequence, which used photographs of university students, is easier to remember than passwords, and it has now been adopted for the United States Senate.

单选题 What is the disadvantage of passwords as mentioned in Paragraph 1?

A. They do not ensure security.
B. They are difficult to remember.
C. They have to be changed frequently.
D. They limit computer accessibility.

【正确答案】 B

【答案解析】[解析] 答案在第一段第三句话。

单选题 One can make a password safer by ______.

A. inserting pictures between numbers
B. avoiding the use of letters altogether
C. setting up a firewall against computer hackers
D. using complicated combinations of numbers and letters

【正确答案】 D

【答案解析】[解析] 答案在第二段第一句话。

单选题 "Passfaces" is a method to get access to a system through ______.

A. remembering a large number of faces
B. selecting photographs of faces one likes
C. recognizing a sequence of face pictures
D. showing one's face in front of the computer

【正确答案】 C

【答案解析】[解析] 答案可由第四段第二句话得出。

单选题 One advantage of "Passfaces" over a password is that ______.

A. it is easier to remember
B. it is more complicated
C. it takes less time to log in
D. it allows one to write less

【正确答案】 A

【答案解析】[解析] 由第四段最后一句可以看出。

单选题 What does the author think of the password?

A. It is an old system that needs improvement.
B. It provides as much security as before.
C. It should be abandoned by computer users.
D. It has developed to an advanced stage.

【正确答案】 A

【答案解析】[解析] 答案在第三段最后一句。