问题
单项选择题
动物在胚胎发育时期，通过胎盘或出生以后通过初乳从免疫母体被动获得抗体而产生的免疫力称（）。
A、自动免疫
B、人工自动免疫
C、天然被动免疫
D、被动免疫
E、天然主动免疫
答案
参考答案：C
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动物在胚胎发育时期，通过胎盘或出生以后通过初乳从免疫母体被动获得抗体而产生的免疫力称（）。
A、自动免疫
B、人工自动免疫
C、天然被动免疫
D、被动免疫
E、天然主动免疫
参考答案：C
My wife Julie and I were out on the road that______around where we live, when we saw a（n）______ worn-out dog stumbling (蹒跚) painfully up the road. We stopped, bent down, talked __38____to the dog and patted it. I______ and there was a collar with a phone number. I called ______ no one answered. The dog was painfully thin. So Julie ran home to get some of our dog’s ______ while I tried to encourage the dog. After Julie came back, we sat down on the sidewalk ______ our new friend made short work of the food. ______we got her home. After trying for many times we got a ______from the number. A lady came around with a bunch of flowers for us. She ______ that Tara had been her father’s dog. She was very old and got lost that morning. So, Tara was ______returned home. Here is the _____of the story: Actually Julie and I were out that morning because I was leaving. She was trying to______me to come back, but I wasn’t hearing ______ that made that sound likely. I was ______ to turn and go when an old black dog walked between us and almost fell down. Suddenly we had something more______than our problem to worry about. There was a creature ______ right before us and we had to work together to help it. We did help it. And here I am writing the story in my own home, in my own family. In the______ “Love Is Not a Fight” Warren Barfield talks about marriage. At one point he sings, “And if we try to leave, ______ God send angels (天使) to guard the door.” Sometimes angels come ______ as dogs.
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