In our online life, we need to use passwords frequently. We use

In our online life, we need to use passwords frequently. We use passwords_____（21）e-mail, gaming sites, social networking sites, and other shopping sites._____（22）, the passwords most people use are not very_____（23）and can easily be"broken"by others. In fact, the most commonly used passwords are so simple that it requires very_____（24）effort to figure them out. Can you guess_____（25）the most commonly used passwords are?They are：Names of baseball teams, birth dates of a family_____（26）, the year of a special sports event, the random numbers like 156468, _____（27）the name of a friend, pet, favorite TV star, or band.
There are programs_____（28）to break into people's online accounts. These programs are_____（29）of trying every word in the English dictionary and the dictionaries_____（30）many foreign languages, in their effort to break into an account._____（31）can even search words backward. Some will try_____（32）words or words that are followed by numbers, _____（33）school222. These programs can test millions of passwords in a few minutes. So, you are advised to be careful about_____（34）passwords so that they will be hard to break. You are also advised not to make them_____（35）hard to remember. Meanwhile, you need to change them once in a while.
25._____
A、what
B、who
C、where
D、which
【正确答案】：A
【名师解析】:The correct answer to question 25 is option A, "what." The sentence is asking for the identification of the most commonly used passwords, which is an inquiry about the nature or the content of the passwords. The word "what" is used to ask for specific information or to inquire about the nature of something, which fits the context of the sentence. The other options, "who," "where," and "which," are not suitable because they refer to people, places, and a selection from a group, respectively, which do not align with the question being asked.