第 19 题 请在（19）处填上最佳答案。

第 48 题

第 46 题

第 45 题 The systems of universities are very vulnerable because they are decentralized and accessible to many people.

第 47 题

第 44 题 Few cases of identity theft are prosecuted because the hackers work in foreign countries.

第 43 题 The actual number of the victim in this case of information theft may be just 1,600 or less.

第 42 题 UCLA had taken away all Social Security numbers from common usage to ensure the computer security.

第 40 题 Wh

根据下面材料，回答第 41～45 题：

第 41 题 UCLA is making an apology because its letters to its students and alumni were stolen by a hacker.

第 38 题 The ch