问题
选择题
植物细胞具有而人和动物细胞不具有的结构是（ ）
①细胞壁；②细胞膜；③细胞质；④细胞核；⑤液泡；⑥叶绿体；⑦线粒体．
A．①②③④
B．②③④⑦
C．①⑤⑥
D．①②⑤⑥⑦
答案
植物细胞具有而人和动物细胞不具有的结构是①细胞壁、⑤叶绿体和⑥液泡．因此只有选项C符合题意．
故选：C．
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植物细胞具有而人和动物细胞不具有的结构是（ ）
①细胞壁；②细胞膜；③细胞质；④细胞核；⑤液泡；⑥叶绿体；⑦线粒体．
A．①②③④
B．②③④⑦
C．①⑤⑥
D．①②⑤⑥⑦
植物细胞具有而人和动物细胞不具有的结构是①细胞壁、⑤叶绿体和⑥液泡．因此只有选项C符合题意．
故选：C．
When I was a child, my parents taught me the difference between good and bad behavior by showing me specific examples. My mother told me that you don’t 36 other kids because you would not like 37 if they hit you. That makes 38 . But, if my mother told me to be “nice” to someone, it was too vague for me to 39 . But if she said that being nice 40 delivering daffodils to a next door neighbor, that I could understand. I believe that doing practical things can 41 the world a better place. When I was in my twenties I thought a lot about the meaning of life. At the time, I was getting started in my 42 of designing more humane facilities for animals at big farms and slaughterhouses(屠宰场). Many people would think that to even work at a slauterhouse would be inhumane, but they 43 that every human and animal 44 dies. In my mind, I had a(n) 45 of a way to make tht dying as 46 as possible. Back in the 1970s, I went to fifty different feedlots and big farms in Arizona and Texas and 47 them work cattle. I cataloged the parts of each facility that 48 effectively. I took the best loading ramps, and other components and 49 them into an ideal new system. I get great 50 when a farmer tells me that my corral (畜栏) 51 helps cattle move through it quietly and 52 . When cattle stay calm, it means they are not scared. And that makes me feel I’ve 53 something important. Some people might think if I could snap my 54 I’d choose to be “normal”. But, I wouldn’t want to give up my 55 to see in beautiful, precise pictures. I believe in them.
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