免疫应答过程的三个阶段是（）
A.识别、激活和效应阶段
B.激活、识别和效应阶段
C.效应、识别和激活阶段
D.识别、增殖和分化阶段
E.识别、分化和增殖阶段
参考答案：A
解析：免疫应答包括三阶段：①识别阶段：抗原加工处理、呈递，T细胞、B细胞通过抗原识别受体对抗原识别过程；②激活阶段：T细胞、B细胞活化，增殖，分化过程；③效应阶段：效应细胞和效应分子发生免疫效应过程。三阶段中不包括T细胞在胸腺内分化成熟过程。
In the professional world, oral communication skills in the workplace, which are the art of using speech to convey information, thoughts and feelings to others, are important for the success of any organizations. The 21st century has been considered to be an era of communication. The way we convey our thoughts is of great importance in building relationships. In the workplace, there are employees of diverse cultural and educational backgrounds. This makes team work on a difficult task, but with a clear understanding of the task to be achieved, all members work towards the same goal. Misunderstandings, conflicts and differences in opinions are easily managed when there is a clear flow of communication between team members. With proper communication, a close relationship and trust build among the employees, therefore promoting excellent working conditions. An atmosphere of support and cooperation is promoted by properly conveying expectations of the management team to the employees and vice versa (相反的情况). Therefore, developing oral communication skills is important to success in life ahead. How to improve oral communication? In the business world, individuals are expected to be confident about their beliefs and ideas. Therefore, they must include words like “in my opinion”， “as far as I know”. While improving skills on oral communication, people in the workplace must learn the art of listening. In addition, one must also have a positive body language during conversations. A person with a smiling face and positive attitude can raise the spirits of everyone around him. When we're talking to someone, we must give the other person an opportunity to talk as it improves our listening ability. Communication is an art and it can be improved by working on it constantly. Since it is not an overnight work, one needs to learn it by observing people who are good at it.
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