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问题 选择题

下列实验操作中，正确的是 [ ]

A．熄灭酒精灯时，用嘴吹灭

B．称量药品时，用镊子夹取砝码

C．反应中没用完的药品，应立即放回原试剂瓶中，以免浪费

D．给试管中液体加热时，液体体积控制在试管容积的1/3~1/2之间

答案

答案：B

改错题

I still remember the morning. My father suddenly wake me up at about 5 and the sky was still gray. I jumped out bed surprised and extreme happy, for we were going to get a book! When we drove to the bookstore, many people were already waiting there. We waited for our turn at about 8:30. I was overjoyed when I got a book, not only because of the book themselves, but also of the love from my father. Never before had I felt such a love from him, because of my father, I believed then, had always been busy with his own work. That was “Harry Potter” that helped I feel the deep love from my parents!
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单项选择题

下列说法不正确的是（）

A.动物克隆的技术基础是动物的细胞和组织培养

B从原代培养物或细胞系中选择和纯化可以获得细胞株，细胞株是具有特殊性质的细胞系

C在细胞培养过程中，细胞之间彼此独立，所以在细胞培养过程中不会出现组织特性

D.通过胚胎干细胞，我们可以在试管中改良并创造动物新品种
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