请根据以下资料回答：
ABC企业计划进行长期股票投资，企业管理层从股票市场上选择了两种股票：甲公司股票和乙公司股票，ABC企业只准备投资一家公司的股票。已知甲公司股票现行市价为每股6元，上年每股股利为0.2元，预计以后每年以5%的增长率增长。乙公司股票现行市价为每股8元，每年发放的固定股利为每股0.6元。当前市场上无风险收益率为3%，风险收益率为5%。
下列说法正确的是______。
A．该企业应购买甲公司股票，不应购买乙公司股票
B．该企业应购买甲公司股票，也应购买乙公司股票
C．该企业不应购买甲公司股票，应购买乙公司股票
D．该企业不应购买甲公司股票，也不应购买乙公司股票
参考答案：A
解析： 由于甲公司股票现行市价6元，低于其投资价值7元，故该企业可以购买甲公司股票；乙公司股票现行市价为8元，高于其投资价值7.5元，故该企业不应购买乙公司股票。
Anger is good for you, as long as you control it, according to new psychology research. A new study from Carnegie Mellon University shows anger may help people reduce the negative impacts of stress and help you become healthier. “Here getting emotional is not bad for you if you look at the case of anger,” said Jennifer Lerner of Carnegie Mellon. “The more people display anger, the lower their stress responses.” Lerner studied 92 UCLA students by asking them to count back from 6,200. They must say out loud every thirteenth number. Researchers disturbed them by asking them to count faster or ask them other questions. If they made any mistakes, they had to restart from the very beginning. Many students felt depressed about making so many mistakes or got angry. Lerner used a hidden video camera and recorded all their facial expressions during the test. The researchers describe their reactions as fear, anger and disgust. Other researchers recorded the students’ blood pressure, pulse and production of a high-stress hormone（荷尔蒙）called cortisol. People whose faces showed more fear during the experiment had higher blood pressure and higher levels of the hormone. Both can have lasting effects such as diabetes（糖尿病）, heart disease, depression and extra weight gain. When people feel fear, negative impacts increase, but when they get angry, those negatives go down, according to the study. “Having that sense of anger leads people to actually feel some power in what otherwise is a maddening（令人发狂的）situation,” Lerner said. Lerner previously studied Americans’ emotional response to the 9/11 terrorist attacks two months after the incident. She found people who reacted with anger were more optimistic. These people are healthier compared with those who were frightened during the event. So in maddening situations, anger is not a bad thing to have. It’s a healthier response than fear. 小题1: What is the story mainly about?
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