下图是人体内某些免疫细胞的分化和免疫过程，数字表示过程，字母表示细胞，请回答有关问题。（1）造血干细胞形成各种血细胞需要经历细胞的_________和_________过程。图中b指的是成熟的_________细胞。（2）图中a是____细胞。在①过程中，a细胞发挥的作用是____抗原，并将抗原____给b细胞。（3）图中③④⑤⑥过程属于____免疫。与③过程相比，④过程的应答反应特点是____。（4）c细胞可识别抗原而被致敏，它需要活化的b细胞分泌____，促进其分裂分化产生____和____。（5）若该抗原为HIV，侵入人体后，攻击的主要对象是上图中的____（填图中字母）细胞，最终会使人丧失一切免疫功能。
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简述教师的特征与职业成就之间的关系。
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These dogs become _______when they are restless as their surroundings suddenly change.
A、aggressive
B、tedious
C、vigorous
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学校管理的基本途径是（ ）。
A、教学活动
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Passage 2Two friends have an argument that breaks up their friendship forever，even though neither one can remember how the whole thing got started. Such sad events happen over and over in high schools across the country. In fact，according to an official report on youth violence，“In our country today，the greatest threat to the lives of children and adolescents is not disease or starvation or abandonment，but the terrible reality of violence”. Given that this is the case，why aren't students taught to manage conflict the way they are taught to solve math problems，drive cars，or stay physically fit？First of all，students need to realize that conflict is unavoidable. A report on violence among middle school and high school students indicates that most violent incidents between students begin with a relatively minor insult. For example，a fight could start over the fact that one student eats a peanut butter sandwich each lunchtime. Laughter over the sandwich can lead to insults，which in turn can lead to violence. The problem isn't in the sandwich，but in the way students deal with the conflict.Once students recognize that conflict is unavoidable，they can practice the golden rule of conflict resolution: stay calm. Once the student feels calmer，he or she should choose words that will calm the other person down as well. Rude words，name-calling，and accusation only add fuel to the emotional fire. On the other hand，soft words spoken at a normal sound level can put out the fire before it explodes out of control.After both sides have calmed down, they can use another key strategy for conflict resolution: listening. Listening allows the two sides to understand each other. One person should describe his or her side, and the other person should listen without interrupting. Afterward, the listener can ask non-threatening questions to clarify the speaker's position. Then the two people should change roles.Finally, students need to consider what they are hearing. This doesn't mean trying to figure out what's wrong with the other person. It means understanding what the real issue is and what both sides are trying to accomplish. For example, a shouting match over a peanut butter sandwich might happen because one person thinks the other person is unwilling to try new things. Students need to ask themselves questions such as these: How did this start? What do I really want? What am I afraid of? As the issue becomes clearer, the conflict often simply becomes smaller. Even if it doesn't, careful thought helps both sides figure out a mutual solution.There will always be conflict in schools, but that doesn't mean there needs to be violence. After students in Atlanta started a conflict resolution program, according to Educators for Social Responsibility,"64% of the teachers reported less physical violence in the classroom;75% of the teachers reported an increase in student cooperation; and 92% of the students felt better about themselves". Learning to resolve conflicts can help students deal with friends, teachers, parents, bosses, and coworkers. In that way, conflict resolution is a basic life skill that should be taught in schools across the country.From Paragraph 2 we can learn that______.
A、violence is more likely to occur at lunchtime
B、a small conflict can lead to violence
C、students tend to lose their temper easily
D、the eating habit of a student is often the cause of a fight
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