题目

随机变量的分布列为：，其中是常数，则的值为（   ） A、    B、    C、    D、    答案：DMost people seem to be passive at work. They do what they are told to do, and they don’t do what they are not told to do. In the end, one thing results: unmotivated (不积极的) people.      We’re employed to think. In fact, no matter how many times our bosses disagree with us, it is our responsibility to think for the company. There are lots of times when I disagree with my boss, and sometimes we even end up having arguments; however, I still offer my suggestions whenever I don’t agree.      Spending more time thinking also helps us to be more efficient (高效的) and helps to reduce our chances of frustration (挫败). Before I do something, I usually need some time to think about it to make sure that what I’m doing makes sense. This can be as long as a few days when a project is big, or as short as only a few seconds for a simple task. After thinking about a project, it sometimes becomes clear that a simple task could achieve the same result. In those cases, not only did I save myself from possible frustration, but I also felt happy and satisfied that I saved valuable resources for my company.      With so many people not taking time to think, it’s no wonder that many people are unmotivated. Today, I encourage you to think things over whenever you have a chance. At first, it might take a while, but once it becomes a habit, you will feel more motivated as you will be more valuable to the company. 1. It is suggested in the passage that people should _____.  A. stop arguing with their bosses　　 B. seize every chance they meet C. present views to their companies　 D. avoid big projects 2. According to the passage, spending more time thinking _________. A. is a waste of time and resources　 B. can help people understand what others do C. can help people impress their companies　 D. is a good way to improve efficiency 3. The author wrote this passage to ________.  A. persuade people to do what they are not told to do B. encourage people to be more motivated C. show people how to give different opinions D. tell people how to form good thinking habits