问题 单项选择题

以下关于死锁检测和恢复叙述错误的是()

A.死锁检测,用于定期检查系统是否发生死锁

B.死锁恢复,用于将系统从死锁中解救出来

C.有效的方法是从后面向前REDO这个事务的部分操作,主要能够解开系统死锁即可

D.为了防止某些事务总是被选做被撤销事务,可以限定每个事务被选为撤销事务的次数

答案

参考答案:C

阅读理解

Weekend getaways and romantic dinners used to be sweet escapes from the daily working life. Nowadays, vacations are often interrupted by the ding of an instant message on a wireless laptop. That’s not news to modern workers, many of whom may just be getting back from a long winter break during which they worked more than in years past. One-fifth of Americans carry a laptop on vacation. Countless more carry cell phones, many of which can be used to check company e-mail.

And why not? With wireless coverage extending, staying connected is simple. Recently, JetBlue Airways announced a trial of free e-mail and instant messaging services for passengers on one of its aircraft. Other airlines are expected to follow suit. But there’s a hidden cost to companies: employee burnout. Using work cell phones and checking company e-mail at the poolside is not a vacation.

“If I were a manager, I would insist that my employees leave their cell phones at work during their vacation and not check their e-mail while away ,” said Dov Eden, an organizational psychologist. “In the long run, the employee will be better rested and better able to perform his or her job.”

A nine-year study of more than 12,000 middle-aged men at high risk of heart disease showed that participants who vacationed more had a lower risk of dying than the vacation-deprived(剥夺的). In a nationwide survey, nearly half of the 2,000 adults questioned said stress has increased in the past five years, with 75 percent ranking money and work as the leading causes of stress.

One way to beat work stress could be to work from home or another remote location. This alternative work arrangement is a win-win set-up. Telecommuting(远程办公)has an overall beneficial effect, because the arrangement provides employees with more control over how they do their work. Telecommuters reported more job satisfaction, less stress and improved work-family balance.

71. According to the first paragraph, Americans carry a cell phone or a laptop on vacation mainly to        .

A. entertain themselves                       B. keep in touch with their family

C. check company emails                           D. tell their managers about their experiences

72. What does the underlined phrase “employee burnout” in Paragraph 2 mean?

A. Employees become very angry.         B. Employees get extremely tired

C. Employees leave the company.        D. Employees demand a pay rise.

73. We can learn from the last paragraph that        .

A. companies have more control over telecommuters

B. telecommuting is good for both companies and employees

C. employees will work more slowly if they work at home

D. telecommuting can reduce the company’s stress

74. Which of the following is TRUE according to the passage?

A. In the past, people on vacation were seldom interrupted by work.

B. Dov Eden agrees with JetBlue Airways’ announcement.

C. Many airlines have been providing their passengers with instant service.

D. Most people are under stress because they have no vacation to relax.

75. What would be the best title for the passage?

A. How to spend your holidays  B. The modern vacation: fully wired, totally ruined

C. Modern life with cell phones  D. Telecommuting-----a win-win set-up

判断题