题目内容

【题目】African Americans ________ about 13% of the population of the United States.

A.account forB.get acrossC.engage inD.contribute to

【答案】A

【解析】

考查动词短语的词义辨析。句意:非裔美国人约占美国人口的13%A. account for (比例)占;B. get across通过;C. engage in从事于;D. contribute to有助于。根据“about 13% of the population of”约占人口的13%,可知,此处表示非裔美国人占美国人口的比例。故选A项。

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【题目】 The sixth mass extinction is not a worry for the future. It’s happening nowmuch faster than previously expectedand it's entirely our faultaccording to a study puhlished Mooday.

Humans have already wiped out hundreds of species and pushed many more to the brink of extinction through wildlife tradepollutionhabitat loss and the use of toxic substances. The findings published in the scientific Journal Proceedings of the National Academy of Sciences( PNAS)show that the rate at which species are dying out has accelerated in recent decades.

Gerardo Ceballos Gonzáleza professor of ecology at the National Autonomous University of Mexico and one of the authors of the studysaid approximately 173 species went extinct between 2001 and 2014. “173 species is 25 times more extinct species than you would expect under the normal extinction rate. ”he told CNN in an email. He and his team found that in the past 100 yearsmore than 400 vertebrate(脊椎动物的)species went extinct. In the normal course of evolutionsuch extinctions would have taken up to 10000 yearsthey said.

Mass extinctions are just as severe as their name suggests. There have been five mass extinction events in the Earth’s historyeach wiping out between 70and 95of the species of plantsanimals and microorganisms. The most recent66 million years agosaw dinosaurs disappear. The past events were caused by catastrophic changes of the environmentincluding massive volcanic eruptions or collision with an asteroid.

The sixth mass extinction the one happening now—is differentscientists say it’s caused by humans. The researchers also said the current coronavirus(冠状病毒)crisis shows people’s recklessness(鲁莽)towards nature can seriously hurt themselves. Many endangered species are dying in large numbers due to the trade in wild animals and plants.

1What does the underlined word“toxic”in Para. 2 mean?

A.PoisonousB.Useful

C.AlternativeD.Environment-friendly


2How does the writer convince readers of the seriousness of the mass extinctions?

A.By listing reliable statistics.

B.By imagining a picture of the extinctions.

C.By mentioning some news from CNN.

D.By explaining the history of the extinctions.

3What is the purpose of the last paragraph?

A.To tell the difference between the fifth and sixth extinction.

B.To explain the cause of the coronavirus crisis.

C.To warn humans to get rid of their wrong actions.

D.To show the writer’s concern about the endangered species.

4What does this article mainly talk about?

A.The changes of the environment do harm to wildlife.

B.The sixth mass extinction is much faster than expected.

C.Mass extinctions are just as severe as their name suggests.

D.The current coronavirus has arisen from the illegal trade.

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1According to the passage,sharing bread____

A.can help to develop unityB.is a custom unique to rural areas

C.indicates a lack of foodD.has its roots in birthday celebrations

2What is the passage mainly about?

A.The custom of sharing food.B.The importance of food in culture.

C.The role of food in ceremonies.D.The specific meaning of food.

3The author explains the role of food in celebrations by

A.making comparisonsB.using examples

C.analyzing causesD.describing processes

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