问题
多项选择题
免疫血清制备的过程涉及（）
A.选择免疫动物
B.免疫方法
C.动物采血
D.免疫血清的纯化
E.抗血清的鉴定
答案
参考答案：A, B, C
搜题请搜索小程序“爱下问搜题”
免疫血清制备的过程涉及（）
A.选择免疫动物
B.免疫方法
C.动物采血
D.免疫血清的纯化
E.抗血清的鉴定
参考答案：A, B, C
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| Loving kindness is twice blessed I felt gloomy (沮丧的) the other day.It had been dark and rainy, and I just didn't feel so _1_. As I was sitting at my desk, I 2 it was the birthday of a dear longtime friend-a single, middleaged woman who has devoted the past 30 years to nursing and loves her 3 . Knowing that she doesn't have a family in town, I 4 to give her a call. Sure enough, she was 5 to work late into the evening, and wouldn't have 6 of a birthday this year. As always, 7 , she sounded cheerful and was happy that I 8 . After I hung up, I couldn't 9 the feeling that she would really appreciate a little attention on her special day. 10 feeling a little gloomy myself, I tried to put it out of my mind, but as the day passed I couldn't shake the thought. I 11 gave in, and that evening set off for the hospital with a card, a cheese cake and some balloons. My friend's grateful smile and joyful surprise 12 me I'd done the right thing and were a generous 13 for the little effort it had taken. When I got home, I realized that not only had I cheered up a 14 friend on her birthday, but my own gloomy feelings had also disappeared. Making her day had 15 my own! Isn't that the way it is 16 we take the time and make the 17 to do something for someone else? It's like the little saying:"Loving kindness is twice blessed; it blesses him who gives, and him who 18 ." Life constantly presents us with 19 to take an extra step or do a kind deed that will make a difference to 20 . And the wonderful thing is that as we do, it changes things for the better for us too. | ||||
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