When we look at birds，we tend to focus on their plumage.But many birds have colorful body parts that are not feathers.So a group of scientists wondered if dinosaurs，the distant ancestors of birds，also had some shining body parts.According to a study published this week，some dinosaurs might have had colorful feet and faces，and these bright body fashions could have been used to attract their mates.
"Living birds use a collection of pigments（色素） and can be very colorful on their legs and around their eyes，" lead author Sarah Davis said in the University of Texas at Austin on Thursday. "We could expect that extinct dinosaurs expressed the same colors."
As is known to us，carrots are a famous example of how carotenoids（胡蘿卜素）make food orange.Data analysis from the past also suggested insights into modern birds.They also give birds their bright yellow，orange and red colors.The study found birds with plant-based diets with plenty of carotenoids tend to have more bright colors in more places on their bodies than meat-focused birds. "The earliest dinosaurs were as big as a small horse and ate such large birds or animals，" said the study's co-author Julia Clarke， "so this led to the coloration of dinosaurs' skin."
However，the fossil（化石） record doesn't give scientists a lot to go on when it comes to determining what color the dinosaurs have，but the study suggests some bright new possibilities for what dinosaurs might have looked like.
（1）What does the underlined word "plumage" in paragraph 1 refer to？ AA
A．Feather.
B．Shape.
C．Foot.
D．Face.
（2）What might contribute to dinosaurs' bright color according to Julia Clarke？ DD
A．Plants in their habitat.
B．Carrots in their bodies.
C．Color from their mates.
D．Pigments from their diets.
（3）What did researchers do to draw their conclusion？ BB
A．They analyzed species of birds.
B．They examined data and fossil.
C．They did research on various animals.
D．They studied the function of pigments.
（4）Where is the text probably taken from？ BB
A．A book review.
B．A news report.
C．A guidebook.
D．A collection of stories.
【考點】自然生態(tài)與環(huán)境保護；說明文．
【答案】A；D；B；B
【解答】
【點評】
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發(fā)布：2024/4/20 14:35:0組卷：0引用：2難度：0.5
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Our school held an activity on last Sunday because it was "Earth Day".Hundred of students took part in it.I am one of them.First，the headmaster gave us a speech about how to protect earth—our home.Then we went hiking，this was about 15km.Although the hiking was very tired，none were left behind.It is no doubt that all of us like the activity.In the future，they will try hardly to protect the environment.We hope we will take part in more activity about caring about the globe.發(fā)布：2024/6/27 10:35:59組卷：0引用：1難度：0.5 -
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（2）By using solar energy，you will make your home far more sustainable.Solong as there is the sun in the sky，the solar panels atop your house will catch the rays and then transform them into electricity.
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You have the power to make a sustainable change to your lifestyle—take the above advice and don't waste it.
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E．There're many easy and simple things you can do to be more sustainable.
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3．The Sixth Extinction（滅絕） Extinctions，where entire species are wiped out，are not unusual in our Earth's history.In fact，over 90 percent of all species that ever lived are now extjye.aict.In the last 500 million years，there have been five times when life on Earth has almost ended.These include the third mass extinction，known as the"Great Dying"，which killed 90% to 96% of all species.And the fifth event，which occurred 66 million years ago，caused the death of the dinosaurs.The reasons for extinctions are varied.According to scientists，they include volcanic eruptions，asteroids （小行星） hitting the Earth from space，changes in sea levels，the decrease of the oxygen content of the sea and global warming.Many scientists say we are now entering the Earth's sixth mass extinction.This time，human activity will be to blame.
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（1）What are the reasons for extinction in the history？
（2）Why does the writer believe we will probably die out if 3/4 of the Earth's species die out？
（3）Please decide which part is false in the following statement，then underline it and explain why.
It is not unusual for species to die out naturally，so we human beings are not to blame.
（4）What actions can we take to avoid the sixth extinction？ （In about 40 words）發(fā)布：2024/6/27 10:35:59組卷：3引用：1難度：0.5
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