问题
选择题
特殊的大肠杆菌能产生大量的胰岛素，对此解释正确的是（ ）
A．大肠杆菌本身能产生胰岛素
B．大肠杆菌的基因经过了自身变异，形成了许多胰岛素基因
C．科学家把控制合成胰岛素的基因转入到大肠杆菌的结果
D．这是不可能的
答案
答案：C
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特殊的大肠杆菌能产生大量的胰岛素，对此解释正确的是（ ）
A．大肠杆菌本身能产生胰岛素
B．大肠杆菌的基因经过了自身变异，形成了许多胰岛素基因
C．科学家把控制合成胰岛素的基因转入到大肠杆菌的结果
D．这是不可能的
答案：C
Tina was a seventeen-year-old girl who always wore a bright smile. She suffered from a disease and had to use a walker most of the time. Maybe it was because she looked and people didn’t know how to come near toher. Tina usually broke the ice with people she met with a big “ ” In one class, I gave the students an assignment (作业) to a poem. I only made the assignment worth a very small part of their total grade since I knew most of my would not do it anyway. In the class, one by one each student to correctly recite (背诵) the poem. Finally, angry and half joking, I said that the next student who recite the poem had to do three push-up (俯卧撑). To my , Tina was next. She used her walker to move to the front of the class. she recited, she made a mistake. Before I could say a word, she her walker and started doing push-ups. I wanted to say, “Tina, I was just !”But she , continued the poem and she finished the rest perfectly. When she finished, a student asked, “Tina, why did you do that? It’s not an important assignment!” “Because I want to be like you guys! To be .” Tina said. Silence fell on the whole room when another student cried out, “Tina, we’re not normal! We are teenagers! We get in all the time.” “I know,” Tina said as a big spread across her face. The rest of the students laughed, too. Tina got only a few that day, but she got the love and respect of her classmates. To her, that was worth a lot more than a grade. 
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