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问题 单项选择题 A2型题

患者，男性，19岁，前牙外伤1小时来诊。查：左上中切牙牙冠完整，位于牙列中，牙髓活力测试无反应，松动Ⅰ°，叩痛（+），X线检查示根尖1／3有水平折裂线，此时宜采取的治疗方案是（）。

A.根管治疗术

B.活髓切断术

C.固定，观察

D.根管治疗+根尖切除术

E.拔除

答案

参考答案：C

解析：对于根尖1/3折断，在许多情况下只上夹板固定，无须牙髓治疗，就可能出现修复并维持牙髓活力。患牙受伤后牙髓活力测试可无反应，数周或数月又恢复，故对牙髓可暂不处理，密切观察，当牙髓有坏死时，则应迅速行根管治疗术。

选择题

下列去括号的各式中①x+（-y+z）=x-y+z；②x-（-y+z）=x-y-z；③x+（-y+z）=x+y+z；④x-（-y+z）=x+y-z正确的是（　　）

A．①②

B．②③

C．③④

D．①④
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单项选择题

Teachers need to be aware of the emotional, intellectual, and physical changes that young adults experience. And they also need to give serious (51) to how they can be best accommodate such changes. Growing bodies need movement and (52) , but not just in ways that emphasize competition. Because they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (53) that comes from achieving success and knowing that their accomplishments are admired by others. However, the typical teenage lifestyle is already filled with so much competition that it would be (54) to plan activities in which there are more winners than losers, for example, publishing newsletters with many student-written book reviews, (55) student artwork, and sponsoring book discussion clubs. A variety of small clubs can provide multiple opportunities for leadership, as well as for practice in successful (56) dynamics. Making friends is extremely important to teenagers, and many shy students need the (57) of some kind of organization with a supportive adult (58) visible in the background.

In these activities, it is important to remember that the young teens have (59) attention spans. A variety of activities should be organized (60) participants can remain active as long as they want and then go on to something else without feeling guilty and without letting the other participants down.

56().

A.groups 

B.individual 

C.personnel 

D.corporation
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