Microplastics are everywhere in our environment.It's hardly surprising that the tiny fragments have also been found in the human body.A new study shows that Americans are consuming as many as 121，000 particles each year.
Measuring 50 to 500 microns in length，microplastics come from a variety of sources unknown about the common existence these materials within the human body，as well as the impact on human health.
Hoping to fill in some of these gaps，a research team，led by Kieran Cox，a Ph.D candidate at the University of Victoria，looked at 26 papers assessing the number of microplastics in commonly consumed food items，among which are seafood，sugar，salt，honey，alcohol and water.The team also evaluated the potential consumption of microplastics through inhalation （吸入） using previously reported data on microplastic concentrations in the air and the Environmental Protection Agency's data on respiration rates Based on these data，the researchers calculated that our annual consumption of microplastics via foods and drinks ranges from 39，000 to 52，000 particles.When microplastics taken in through inhalation are taken into account，the range jumps to between 74，000 and 121，000 particles per year.
The authors of the study found that people who drink exclusively from plastic water bottles absorb additional 90，000 microplastics each year，compared with 4，000 among those who only consume Tap water， "This shows that small decisions，over the course of a year，really matter and have an impact. "Cox says.The new study，according to its authors，was the first to investigate accumulative human exposure to microplastics".But in all likelihood，the research tells only a small part of the entire story.Collectively，the foods and drinks that the researchers analyzed represent 15 percent of Americans caloric intake.The team could not account for food groups like fruits，vegetables and grain because there simply is not enough data on their microplastic content.
For those who worried about microplastic consumption，cutting down bottled water is a good lace to start.But for the heart of the problem，we have to stop producing and using so many plastics.
（1）What makes it difficult to know microplastics commonly exist in the human body？ CC
A．The quality of microplastics.
B．The quantity of microplastics.
C．The size of microplastics.
D．The shape of microplastics.
（2）How did Kieran Cox's team calculate the potential consumption of microplastics？ AA
A．By analyzing existing data.
B．By comparing the impact.
C．By studying papers.
D．By conducting experiments.
（3）What can we know according to the text？ BB
A．the study is among the earliest ones to investigate human exposure to microplastics.
B．Drinking less plastic bottle water helps to take in fewer microplastics.
C．Cox's team gained comprehensive information of microplastics taken in by humans.
D．People consume 74，000 to 121，000 particles of microplastics per year from foods and drinks.
（4）What is the best title for the text？ BB
A．The Potential Problems of Microplastics.
B．Microplastics Found Within Human Bodies.
C．Microplastics Coming From Various Sources.
D．The Impact of Microplastics on Human Health.
【考點(diǎn)】說明文；環(huán)境保護(hù)．
【答案】C；A；B；B
【解答】
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發(fā)布：2024/4/20 14:35:0組卷：2引用：1難度：0.5
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The government said that the policy speaks for itself and that online coursework is not worth a visa.So far，not any sign of change has been within sight.As students are waiting for the policy to improve，their fall programming and their future remain in limbo.
（1）Why would international students prefer to stay in the US during the pandemic？
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（2）What do international students staying in the United States think of the new rule？
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D．Unbelievable.發(fā)布：2025/1/6 15:30:8組卷：0引用：1難度：0.5 -
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（1）According to the author，people enjoyto seek nature.
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C．shopping in the supermarket
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（2）From the second paragraph，we can see that.
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（4）what is the main idea of this passage？
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D．Man can't live without natural areas.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5 -
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A．The loss of any species can affect humans.
B．Endangered species are paid more attention to by humans.
C．Species can still survive when their ecosystems are destroyed.
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（2）What does the underlined word "ecocide" in paragraph 2 mean？
A．Ecosystem protection.
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D．Habitats protection.
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A．Population growth in hotpots.
B．Migration out of these areas.
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A．It's simple to carry out.
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C．It's closely connected with local people.
D．It suggests that the local people are well educated.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5
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