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题型:阅读理解-阅读单选 难度:0.65 引用次数:44 题号:19348053

As a popular subject of study among evolutionary ecologists, the three-spined stickleback (三刺鱼) is known for their different shapes, sizes, and behaviors—they can even live in both sea water and fresh water, and under a wide range of temperatures. But what makes that?

The researchers tracked six populations of the fish before and after seasonal changes to their environment, using genome sequencing (基因组测序) . Seasonal changes result in great changes in habitat structure and balance of salt and freshwater, and only those fish able to tolerate these rapid changes survive into the next season.

“These changes probably resemble the habitat shifts experienced by stickleback populations during the past 10,000 years, says Professor Barrett “We hope to gain insight into the genetic changes that may have resulted from natural selection long in the past.”

Remarkably, the researchers discovered the evidence of genetic changes driven by the seasonal shifts in habitats, which mirrored the differences found between long-established freshwater and saltwater populations. “These genetic changes occurred in independent populations over a single season, highlighting just how quickly the effects of natural selection can be detected,” says Professor Barrett, “the findings suggest that we may be able to use the genetic differences to predict how populations may adapt to the environment.”

The research emphasizes the importance of studying species in dynamic environments to gain a better understanding of how natural selection operates. In the further research, they plan to investigate how repeatable the observed genetic changes are, by testing whether they show up year after year. Doing so would demonstrate their ability to reliably forecast the evolutionary future of these populations.

1. What is paragraph 2 mainly about?
A.The difficulties of the research.B.The purpose of the research.
C.The background of the research.D.The methods of the research.
2. What is the main reason for the three-spined stickleback’s survival?
A.Habitat shifts.B.Genetic changes.
C.Seasonal changes.D.Independent populations.
3. Why will scientists study the repetition of the genetic changes?
A.To know what natural selection is.
B.To study species in dynamic environments.
C.To test the reliability of the present discoveries.
D.To forecast the evolutionary future of certain species.
4. Where is the text from?
A.A science magazine.B.A science fiction.
C.An advertisement.D.A novel.

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【推荐1】Summer has finally arrived, which means kids are bound for the outdoors. It can be exciting for kids and parents to have a great opportunity to go swimming, picnicking or on adventures. This time of year is also a dangerous time of year as almost half of all injury-related deaths in children occur between May and August. Whether it be in the pool, on bike, out in the sun or in the backyard is always important. Here are some tips to keep the family safe over the summer.

Water Safety

At this time of year, drowning deaths among children skyrocket(飞涨) compared to the rest of the year. Never leave your child alone in the water, even in shallow water. A child can drown in as little as one inch of water. Enroll your children in swimming lessons. Some swim schools offer class for children as young as 6 months.

Sun Safety

We are fortunate enough to live in the Sunshine State, where sun shines year-round. But with all the time you and the kids will be spending outdoors this summer, it’s important to protect yourself. Make sure to use a widely-used sunscreen(防晒霜) that blocks both UVA and UVB sunlight. Cotton clothing has an estimated SPF of only 6, so even if your kids are going out wearing T-shirts and shorts, make sure they are covered up.

Bike Safety

Nothing says summer like a nice neighborhood bike ride. But bikes are not toys and can certainly cause injury. Don’t forget to always wear a helmet. Head injuries are reduced by 85 Percent when riders wear a helmet and other safety equipment like knee and wrist pads. It’s estimated that 75 percent of bicycle-related deaths could have been prevented with bicycle helmets. When riding on the street, make sure kids understand all riding hand signals, ride with the traffic flow and stay as far right as possible.

1. Summer is called a dangerous time because children             .
A.are easily injured
B.enjoy staying in the sun
C.want to learn swimming
D.refuse to accept advice
2. What can be learned from the passage?
A.Kids only need to wear T-shirts and shorts.
B.Bikes, like toys, seldom lead to injury.
C.Some swim schools offer children class for free.
D.Deaths from drowning increase suddenly in summer.
2017-09-06更新 | 104次组卷
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文章大意:这是一篇说明文。本文介绍了中国传统节气“大雪”期间,人们应该注意的五件事情。

【推荐2】The traditional Chinese lunar calendar divides the year into 24 solar terms. Major Snow, the 21st solar term of the year, begins this year on Dec 7 and ends on Dec 20.     1    . Here are five things you should know.

Snowy winter

    2    , breaking tree branches and blocking the road. In the south, snowflakes fall and the world turns white. A proverb about the snow says, “A timely snow promises a good harvest”. As the snow covers the ground, the low winter temperature kills pests.

Appreciating plum blossoms

Plum blossoms usually flower in mid-to-late December in some southern cities of China, and sometimes bloom even earlier. The plum blossom is admired in Chinese culture for its toughness during severe winters.

Eating lamb

Lamb is a favorite food for Chinese people during Major Snow.     3    . People in Chongqing like to have potted lamb soup or stewed lamb soup with their families and friends.

Eating porridge

Hot porridge could help warm you and nourish (滋养) your body in cold weather. In China, it’s customary to eat red bean porridge on the first day of Major Snow.     4    , such as wheat porridge, sesame porridge, radish porridge, walnut porridge and tuckahoe porridge.

Preventing lung illness

During this period, Chinese people watch for outbreaks of lung illness, which can be prevented by properly drinking water. During Major Snow, it’s drier and colder, so people should drink more water. But you should not drink too much water at once.     5    .

A.In addition, there are other varieties
B.People in southern China make sausages
C.The snow falls at night and melts in the day
D.Don’t drink cold water after exercise, either
E.The snow in North China may last a whole day
F.It’s excellent for protecting the body against the cold
G.During this period, the temperature drops significantly
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阅读理解-七选五(约220词) | 适中 (0.65)
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【推荐3】Summer is a time to look forward to because there is no school to get you down.     1     . You just need to stay active, occupied, and have an open mind.

●Read if you feel bored

Subscribe to a magazine or comic if you don’t like books. Choose whatever age-appropriate book that interests you and start reading. You can read anywhere. In your backyard or on your balcony, on your bed, or out by the lake.     2     .

●Get caught up on schoolwork.

Not all of us are straight “A” students. Take this time to go to the library and review material for the next year in advance.     3     . No need to rush or stress out. It’s just important not to forget anything you learned in the past year over the summer.

●Travel.

    4     , start packing now! Can’t afford to travel far? No problem! Do some exploring in your own city. Go on a road trip with your friends and family. Find out what’s on the other side of that lake. Be creative!

    5    

If summers are hot where you live, you can go to the beach with your family or friends. Also, some water parks have great discounts at times during the summer. But be careful, if there’s a heat wave outside, you’d better stay out of the sum, or even go indoors.

A.Beat the heat.
B.Reading doesn`t have to be boring
C.Spend a lot of time outside.
D.If you usually go on vacation in the summer
E.Since it’s summer, you can do this at your own pace
F.To have a good summer, you don’t have to do anything expensive.
G.If you don`t have much time.
2023-05-31更新 | 62次组卷
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