单词：quadratic-free number
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A: What do you need? B: I need to use the Internet. A: You have your library card, right? B: Yes, I do. A: There is a wait right now to use the computers. B: Thats fine. A: Would you please write your name on this list? B: Then what? A: I will call y
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This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? Athletes have obviously been tempted to use performance enhancing anabolic steroids. Drug testing may discourage such use. But a new study finds that some of the perfo
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I have now worked in seven states across India, and weve looked at human-wildlife interactions, particularly human-wildlife conflict ranging from crop loss, livestock predation, human death, human injury and property damage. Krithi Karanth, a Wildlif
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星级典句： 第一句：I'll let him know. 我会转达的。 A: I wonder if you could give Mr. Wang a message for me. 能否请您帮我给王先生留个言？ B: Yes, certainly. 好的，当然可以。 A: There will be a very urgent meeting a
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China is reforming its graduate school education system this year to make it available to more students and more valuable in the increasingly competitive job market. But will these changes have their intended effect? My colleague Zhong Shi joins me i
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Key Sentences(重点句子) 134．How may I direct you call？ 您要哪里？ 135．Could I have extension 239，please？ 请转接分机239。 136．I'm sorry the number's engaged． 对不起，这个电话有人在打。 137．The line is free n
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