问题
填空题
蛋白质的二级结构是指指多肽链骨架部分氨基酸残基有规则的周期性空间排列，即（）。
答案
参考答案：肽链中局部肽段骨架形成的构象
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蛋白质的二级结构是指指多肽链骨架部分氨基酸残基有规则的周期性空间排列，即（）。
参考答案：肽链中局部肽段骨架形成的构象
This is the VOA Special English Education Report. A few weeks ago, we talked about the Test of English as a Foreign Language, or TOEFL. A listener in Cambodia named Thida asks if American colleges and universities also accept the IELTS exam. IELTS is the International English Language Testing System. It was developed by the University of Cambridge ESOL examiners. Cambridge ESOL says the test measures true-to-life ability to communicate in English for education, immigration or employment. The IELTS tests listening, reading, writing and speaking skills. It uses a mixture of accents and spellings, including British English and American English. The test is used by government agencies, schools and professional organizations in one hundred and twenty countries. And, yes, that includes the United States. The many American schools that accepted the IELTS can be found on the Web at felts.org. Some schools accept both the TOEFL and the IELTS, but the graduate school at Duke University in Durham, North Carolina, for example, says it prefers the IEITS. The listening and speaking parts are the same for everyone who takes the IELTS, but people have a choice of reading and writing tests -- either academic or general training. The listening test takes thirty minutes. There are forty questions based on a recording. The reading test takes sixty minutes. Students answer forty questions based on three written passages. The writing test also takes sixty minutes. Students have to write two essays. One essay has to be at least one hundred and fifty words long and the other at least two hundred and fifty words. The shorter one is description of something; the longer one has to support and argument. The speaking test takes less than fifteen minutes. The score is based on a recorded talk between the student and a test examiner. And that's the VOA Special English Education Report, writt  en by Nancy Steinbach. If you have a general question for our series, write to special@voanews.com. I'm Barbara Klein.小题1:What does TOEFL stand for?
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