单词：zirconium dioxide oxygen analyzer
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CHAPTER TWO Reading POLLUTUO FIGHTERS [00:09.90]Judy is collecting some facts for a class project on pollution. [00:18.44]She is interviewing Doctor Ray,a scientist,about trees. [00:27.51]Judy:Why are you so interested in trees,Doctor Ray? [00:38.16]
上海牛津初中英语八年级
.....green plants ultimately. When it first appeared therefore, it would have been seen as a poison, it would have been a pollutant. But gradually, through Darwinian natural selection, living organism
寻访外星人
Dear Editor, I live in Paris,France.In my country there is a famous site,called the Chauvet Caves.I am very worried about it because some of the cave paintings have been destroyed by air pollution.No,the pollution does not come from cars or factories
高中英语听力人教版第一册
We were left with this atmosphere made of molten rock and vaporous rock. It took millions of years for that atmosphere to fall out and to be replaced by an atmosphere made up of nitrogen and carbon dioxide and water vapour. These new gases came from
探索与发现2014年
Although our cell was large, we obviously had used up most of the oxygen it contained. 虽然牢房还算宽大，但很明白，我们已经消耗掉了里面大部分氧气。 In essence, over an hour's time a single human being consumes all the ox
《海底两万里》中英双语有声读物