单选题：Passage OneQuestionsare based on the following passage．Arcti

Passage One
Questionsare based on the following passage．
Arctic Ocean ice may hold trillions of small piecesof plastic and other synthetic trash，and they are beingreleased into the world’s oceans as global warming melts the polar cap，researchers say，Though the finding is surprisingand worrying，the possible harm to marine life is so farunknown，the authors concluded．calledmicro plastics，the pollutants come mostly from debristhat has broken apart，as well as from cosmetics andfibers released from washing clothes，according to theStudy，which was published in the journal Earth’s Futureand first reported by Science magazine．
At current melting trends more than l trillion pieces 5 millimeters or smaller could wind up in the oceans during the coming decade．the authors estimate．The concentration of plastic debris is 1，000 times greater than that floating in the so．called Great Pacific Garbage Patch．The researchers based theirfindings on core samples of ice taken during polar expeditions in 2005 and 2010．
Rayon was the most common synthetic material discovered—54%．Though rayon is not a plastic（it’s made from wood），the authors included it “because it is a man made semi．synthetic that makes up a significant proportion of syntheticmicroparticles found in the marine environment．”Rayon is used in cigarette filters，clothing and personal hygieneproducts．Polyester（聚酯）was the next most common pollutant found in the ice（21%），followed by nylon（16%），polypropylene（聚丙烯）（3%）and polystyrene，acrylic and polyethylene （2%each）．
The authors called the ice trap “a major historicglobal sink of man．made particulates．”andsaid their findings “go some way to help clarify one of the most puzzlingaspects of current understanding on the quantities of plastic debris reportedin the oceans．”As Science points out，288 million tons of plastics were produced in 2012．
Micro plastics garbage has also been found on the shores of southernmost Chile，so the authors said it’s time toinvestigate the planet’s other polar region．“Whilemultiyear sea ice makes up a smaller proportion of annual sea ice cover in theSouthern Ocean．and perennial sea ice cover aroundAntarctica is following different trends，our findingindicate the importance of sampling ice from the Antarctic to see if it too containsmicro plastics，”they write．
注意：此部分试题请在答题卡2上作答。
According to the passage．what are mainly called “micro plastics”？ A．The pollutants come mostly fromdebris．
B．The pollutants come mostly fromfibers．
C．The pollutants come mostly fromcosmetics．
D．The pollutants come mostly fromdaily supplies．