问题
单项选择题
有关补体系统的蛋白叙述正确的是（）
A.经典和替代激活途径中均有C3参加
B.在免疫应答时浓度不升高
C.可以参与IgG、IgM型的血清反应，但不能参与IgE的反应
D.可在某些免疫缺陷患者表现为补体缺失
E.以上都对
答案
参考答案：E
搜题请搜索小程序“爱下问搜题”
有关补体系统的蛋白叙述正确的是（）
A.经典和替代激活途径中均有C3参加
B.在免疫应答时浓度不升高
C.可以参与IgG、IgM型的血清反应，但不能参与IgE的反应
D.可在某些免疫缺陷患者表现为补体缺失
E.以上都对
参考答案：E
Lulu is a brave pet in our shelter. As you know, there are a lot of forest fires during the summer season. Many forests are badly damaged by fire each year. Not far from our shelter, a forest caught fire during this hot summer. We were in a heat wave which had been 31 for three days. Lulu rushed towards the forest where flames sent out a terrible 32 ．I no longer had any hope that Lulu would come back to the shelter．In fact, I was waiting for the firemen to announce his 33 in the forest, when suddenly, a fireman burst into my shelter and informed me that my dog Lulu had 34 to save four kittens(小猫) who were trapped by the flames．According to the fireman, Lulu seized the kittens, one by one moving them to a safe place．I immediately accompanied(陪同) the fireman to the forest to 35 the rescued kittens．When we arrived 36 the scene of the incident, we found Lulu was not there. Then we heard the 37 of a dog from the forest barking furiously (猛烈地). I recognized it was my dog Lulu．The fireman followed the tracks of the dog until we found him barking 38 by the side of an injured fireman who was lying on the ground and desperately(绝望地) waiting for rescue．Thanks to Lulu, four kittens and a fireman were saved. That day, I was very proud of Lulu for his two heroic(英雄的) 39 toward the kittens and the fireman．Lulu showed much compassion (同情) for both animals like him and for a human being who was trying to 40 the fire with his colleagues(同事)． This true story of genuine(真的) love and compassion shows us that pets are loving, caring and considerate(考虑周到的)．We should love and protect them．One day they could do us a good turn.
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