问题
选择题
下列生物学研究选择的技术(方法)恰当的是[ ]
A．用3H标记的尿嘧啶核糖核苷酸研究DNA的复制
B．利用纸层析法提取叶绿体中的色素
C．利用低温诱导植物细胞染色体加倍
D．利用杂交法研究人类遗传病的传递规律
答案
答案：C
搜题请搜索小程序“爱下问搜题”
下列生物学研究选择的技术(方法)恰当的是[ ]
A．用3H标记的尿嘧啶核糖核苷酸研究DNA的复制
B．利用纸层析法提取叶绿体中的色素
C．利用低温诱导植物细胞染色体加倍
D．利用杂交法研究人类遗传病的传递规律
答案：C
When we talk about a bad man, we like to call him a “wolf”. But is it really true that the wolf stands for devil and ugliness？ Have you read the book “The Wolf Totem” by a famous writer Jiang Rong, which tells the story of the relationship between wolves and human beings? Have you ever 36 the wolves' world? If you had, you would 37 the wolves. In the book, wolves are heroes on the large grassland. They know more about 38 than humans. They can attack lambs without disturbing their mothers. They also know how to 39 full use of the shape of land to 40 sheep. I believe that if wolves were humans, they would be 41 experts good at fighting. The wolf is a kind of special creature that can deeply understand 42 . Each wolf serves its group with its heart and soul. A 43 wolf has little power, but a pack of wolves 44 nothing. All the wolves obey the rules. 45 they are defeated, they run away together. It is their teamwork 46 makes wolves powerful. The wolves also have great self-respect and won't 47 to anyone. The writer, who wrote the book “The Wolf Totem”, 48 stole a one-month-old baby wolf and raised it very carefully. To his 49 , he found the little wolf still wanted to go back with 50 wolves. He bit through the iron chain that limited him. The wolf was 51 and he never gave in, fighting 52 his death. The little wolf died as a glorious fighter. I was shocked by this kind of 53 : wolves are one of the most respected creatures on earth. I want everyone to look at wolves in a 54 way. They are our teachers. They show us how to survive and 55 in this not simple and dangerous world. Please honor the wolves, please honor all these heroes of nature!
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