单词：chemistry of organic compound
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Review Exercise E: Two- and Three-Word Set Phrases CD 3 Track63 You should be pretty familiar with the idea of a set phrase by now. The next step is when you havemore components that link together to form a new thinga three-word set phrase. Combine t
标准美语发音的13个秘诀 CD3
Autobiography of Nobel Prize Winner: Jean-Marie Lehn I was born on September 30 1939 in Rosheim, a small medieval city of Alsace in France. My father, Pierre Lehn, then a baker, was very interested in
英语沙龙2004全年合辑下
Narrator: Exercise 3.8. Dictation 1: Air pollution / is probably the modern world's greatest threat. / Water can be filtered, / land can be cleared, / but filthy air can only be filtered / by the nose and lungs. / It is estimated / that living in a b
202 Useful Exercises for IELTS
It seemed like a good ideabecause rivers and ponds in Bangladesh were contaminated with bacteria, Bangladeshis switched to wells. But soon after, in the early 80s, researchers realized those wells were harming Bangladeshis with a new poisonarsenic. T
Scientific American(十一)月
The early Earths oceans were home to a lot of interesting chemistry. Now scientists have found that amino acids thought to be present way back when could have been cooked into other compounds vital for lifean idea you should take with a grain of salt
Scientific American(九)月
AS IT IS 2016-10-05 Nobel in Chemistry Goes to Makers of Worlds Smallest Machines 2016诺贝尔化学奖:世界上最小的机器 Three scientists have won the Nobel Prize in Chemistry for their work in developing tiny machines. The three men are Jea
2016年VOA慢速英语(十)月