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If you were asked to imagine a scientist，what image would come to your mind？The common idea that most kids from kindergarten through college have of a scientist is a man wearing a white lab coat with messy hair，big glasses，and several glass cups of mysterious colourful liquids giving off clouds of smoke.As for adults，the majority view scientists as strange people who spend 100 hours a week slaving away in a lonely laboratory.However，the reality is quite different.
   Recently I've had a chance to take part in a scientific experience far from my laboratory and into Costa Rica.It supports a huge amount of wildlife due to its geographical placement between North and South America.It is home to more than 500，000 species，which are at present nearly 4% of the total species worldwide!
   First we worked alongside conservationists to preserve wildlife at a leatherback turtle（棱皮龜）rescue centre.We helped the volunteers preserve the turtle population by removing rubbish from the shoreline to create a safe environment for turtle eggs to come out.After that we stayed at Mount Arenal where we studied seismic activity relating to earthquakes.During our stay at Arenal，we rode over the mountainous areas and took a long walk through the rainforest.After reaching the top，we went down and through waterfalls to the beautiful valley below!On the last day we got a hands-on introduction to rocket science where we learned about new rocket technology that will be used on the international space station.
   During my Costa Rica experience，I know that being a scientist doesn't mean working in a lab all day and night.A scientist is one who loves learning and getting a better understanding of the world from helping preserve wildlife，learning about earthquakes or inventing rockets.I think that schools should really stress that science is so much more than wearing a lab coat and mixing chemicals.Kids need to be aware of the excitement and adventures science can bring!

（1）According to the first paragraph，scientists are often believed
B
B
.
A．to work as slaves
B．to spend too much time in labs
C．to behave in a strange way
D．to do experiments in messy labs
（2）How did the author help to preserve the turtle population？
C
C

A．By creating a safe nest for turtles.
B．By collecting the turtle eggs on the beach.
C．By picking up rubbish from the shoreline.
D．By finding a comfortable environment for turtles.
（3）What does the author learn about science from his experience？
B
B

A．Science is full of boring experiments.
B．Science is more than working in a lab.
C．Science is related to mysterious liquids.
D．Science is about wildlife and earthquakes.
（4）What might be the best title of this passage？
A
A

A．What a Scientist Is Like
B．My wonderful experience in Costa Rica
C．the Adventures and Excitement Science Can Bring
D．the Secrets behind Science Phenomena（現(xiàn)象）.

【考點】科普知識；說明文．
【答案】B；C；B；A
【解答】
【點評】
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發(fā)布：2024/6/6 8:0:9組卷：1引用：3難度：0.5
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  • 1．Astronauts travelling in space meet forms of radiation that are uncommon on Earth.Some of this radiation has been shown to be harmful to human health.It is linked to cancers and heart problems.Yet a new American study suggests the radiation does not shorten astronauts' lives.
       Researchers studied nearly 60 years of health records and other data about male astronauts from the United States.They then compared this data with information about a group of men who are in good health，richer than most Americans and receive good health care-professional athletes.The study found that neither group has higher rates of dying at a young age.In fact，both groups generally live longer than other Americans.
       Astronauts are usually well educated，earn more money and are in better physical condition than the average American.Some earlier research has linked being an astronaut to a lower risk of early death，the researchers noted.The findings were reported in the publication Occupational & Environmental Medicine.
       Much of the existing research on mortality rates in astronauts has not yet explored the mental and physical demands of this job.There also has not been a lot of research on whether astronauts show what is known as the "healthy worker effect".This effect leads people with employment of any kind to have fewer medical problems than people who are unable to work，said Robert Reynolds.
       Reynolds said， "The challenge has always been to understand if astronauts are as healthy as they would be had they been otherwise comparably employed but had never gone to space at all.To do this，we need to find a group that is comparable on several important factors."

    （1）How did researchers carry out their study？

    A．By doing interviews.
    B．By analysing some factors.
    C．By comparing different data.
    D．By doing experiments in the lab.
    （2）What can we learn from the text？

    A．All radiation is harmful to human health.
    B．Athletes tend to be poorer than most Americans.
    C．Healthy worker effect makes working people healthier.
    D．Research has explored the mental and physical demands of being astronauts.
    （3）What can be inferred from Reynolds' words？

    A．Researchers are determined to face the challenge.
    B．The research is almost impossible to conduct.
    C．Several important factors hold back the research.
    D．Astronauts are as healthy as they would be if they haven't been astronauts.
    （4）What can be a suitable title for the text？

    A．Astronauts-healthy or otherwise
    B．Astronauts are as healthy as athletes
    C．Radiation affects astronauts' health
    D．Astronauts-well-educated and earn more

    發(fā)布：2024/11/9 9:0:1組卷：7引用：1難度：0.6

  • 2．Some caterpillars' warning signals（信號）may have evolved（進化）from walking.
       A team，writing in the journal Nature Communications，reported that the hair-like structures the living things use to make sounds evolved from legs.
       The team studied caterpillars which use these structures to communicate their ownership of leaves.This means the caterpillars are able to"tell"strangers to go away without risking injury in fighting."These are really interesting caterpillars，"said Dr.Jayne Yack from Carleton University in Ottawa，Canada，who led the research."They make signals using hair-like structures which are on their back ends."
       The caterpillars drag these structures across the leaf to make scraping（刺耳的）sounds when strangers enter the area of their leaves."When they make this signal，the strangers leave，"explained Dr.Yack."It's like saying'I'm here，get out of here-I already own this leaf '."
       The scientists looked at other species（物種）within the same group of caterpillars and created their"family tree".They used chemical markers（標記物）to work out the relationship between the animals，showing which in the group were the more ancient species and which species evolved more recently."Those more ancient species actually don't have these sound-producing structures.They have legs that they use to walk towards strangers，"said Dr.Yack.These more ancient species，she explained，walk towards strangers and try to fight against them."They can kill each other in the fighting，"Dr.Yack added.She said that the evolution of the scraping show had allowed the caterpillars to solve their fighting without injury."So our idea is that these signals actually avoid harm to both sides-they solve fighting in a more' friendly' way."
       The study also provides a map of an evolutionary process that many other biologists are researching.

    （1）What can we learn about caterpillars' warning structures from the text？

    A．They have the same use as hair.
    B．They are found in caterpillars' heads.
    C．They are used to fight against strangers.
    D．They may have evolved from caterpillars' legs.
    （2）According to the text，Dr.Yack's team did NOT
    .
    A．draw a family tree of caterpillars
    B．create a map to show how caterpillars evolve
    C．study species within the same group of caterpillars
    D．make clear the relationship between different species of caterpillars
    （3）What does the underlined word"They"in the fifth paragraph refer to？

    A．The ancient species.
    B．The chemical markers.
    C．The sound-producing structures.
    D．The more recently evolved species.
    （4）What is the main idea of the text？

    A．How caterpillars evolved.
    B．How caterpillars warn strangers.
    C．Communication between caterpillars.
    D．Caterpillars' warning signals evolved from walking.

    發(fā)布：2024/10/19 0:0:1組卷：13引用：2難度：0.5

  • 3．Last year I introduced my new policy on absences to my classes：None would be（1）
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    ．Most students seemed to realize that it（5）
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    ．There are also other advantages having a（14）
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    ，homework is generally（16）
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    發(fā)布：2024/10/25 17:0:1組卷：1引用：1難度：0.3
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