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A．They usually listen to the radio at home.B．They usually play the guitar at home.C．Th

A. They usually listen to the radio at home.
B. They usually play the guitar at home.
C. They go out to dinner and drink beer.
D. They usually play the piano at home.

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假定阅读框开始于下列每个核苷酸序列的头三个碱基，预计以它们为mRNA模板在蛋白质合成中所形成肽链的氨基酸

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【B12】

A. alternated
B. modified
C. refined
D. deleted

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听力原文：M: Cindy! Have you heard the news？
W: No, Steve. What do you mean？
M: You know all the classes we've missed because of the snow？
W: Uh oh...
M: Yup—we're going to have to make them up and the dean says it will have to be during spring break.
W: Steve! We have our vacation all set! What are we going to do？ Do the others know？
M: I don't know but I certainly can't afford to miss five days of classes this semester, with that week I was sick...
W: But I really don't want to cancel our trip. All of us have already made our plane reservations!
M: I can try to call the travel agency; maybe they can refund our money. But before we do anything we need to speak with our professors.
W: You think they'll excuse us from class？
M: Probably not. But I was talking to Kevin this morning and he said that one of his professors told him that they could make up the class at a different time.
W: Wow—that's great! Which professor was it？
M: I don't know. But we're going to have to speak to all of them any way.
W: Why didn't they add extra days at the end of the semester before summer classes？
M: Because of the graduation date, which can't be changed.
W: Are other colleges around here doing the same thing？
M: I would imagine so—it's been such a bad winter and we've missed too many classes. We do really need to make them up.
W: I know, I know. I was just really looking forward to this vacation. The idea of the sun and the beach!
M: Oh look, there's Professor Hampton right now!
W: Come on, let's go talk to her!
(23)

A. They may not be able to take their vacation.
B. It may snow during their vacation.
C. They me going to need more money.
D. They may miss graduation.

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预测当赖氨酸密码子第一个碱基由A变为G时对蛋白质结构与功能的影响。

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A．They usually listen to the radio at home.B．They usually play the guitar at home.C．Th

A. They usually listen to the radio at home. B. They usually play the guitar at home. C. They go out to dinner and drink beer. D. They usually play the piano at home.

假定阅读框开始于下列每个核苷酸序列的头三个碱基，预计以它们为mRNA模板在蛋白质合成中所形成肽链的氨基酸

【B12】

预测当赖氨酸密码子第一个碱基由A变为G时对蛋白质结构与功能的影响。

A. They usually listen to the radio at home.
B. They usually play the guitar at home.
C. They go out to dinner and drink beer.
D. They usually play the piano at home.