正确答案: C

氢键方向基本与长轴平行

题目：下列关于蛋白质a-螺旋结构的描述正确的是

解析：C

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举一反三的答案和解析：

[单选题]高等植物光系统Ⅱ的作用中心色素分子是

P680

[单选题]在商品生产过程中，生产资料的价值是借助生产者的

具体劳动转移到新产品中

[单选题]承认“非此即彼”，又在适当的地方承认“亦此亦彼”。这是

辩证法观点

[单选题]Conversation becomes weaker in a society that spends so much time listening and being talked to _______ it has all but lost the will and the skill to speak for itself.

that

解析：选［C］。本题要求考生能够迅速识别出so ... that句型。

[单选题]根据下列文章，回答41～45题。Directions：In the following article, some sentences have been removed. For Questions 41-45, choose the most suitable one from the list A-G to fit into each of the numbered blanks. There are two extra choices, which do not fit in any of the blanks. Mark your answers on ANSWER SHEET 1. （10 points）The time for sharpening pencils, arranging your desk, and doing almost anything else instead of writing has ended. The first draft will appear on the page only if you stop avoiding the inevitable and sit, stand up, or lie down to write. ______（41）________

It makes no difference how you write, just so you do. Now that you have developed a topic into a tentative thesis, you can assemble your notes and begin to flesh out whatever outline you have made.