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题型:阅读理解-阅读单选 难度:0.65 引用次数:306 题号:9499380

Scientists think they have the answer to a puzzle that confused even Charles Darwin: How flowers evolved and spread to become the most important plants on earth.

Flowering plants, or angiosperms (被子植物), make up about 90% of all living plant species,but how they did this has been a mystery. New research suggests it is due to genome (基因组) size.

Hundreds of millions of years ago,the earth was dominated by ferns (蕨类)and conifers(针叶树) - they were the main plants on the earth. Then, about 150 million years ago, the first flowering plants appeared on earth. They quickly spread to all parts of the world.

Why angiosperms were successful and diverse on earth has been debated for centuries.Charles Darwin himself called it a "mystery", fearing this apparent sudden change might challenge his theory of evolution.

Kevin Simonin from San Francisco State University in California US and other researchers analyzed data held by the Royal Botanic Gardens, Kew, on the genome size of hundreds of plants, including flowering plants, gymnosperms (a group of plants including conifers) and ferns. They then compared genome size with anatomical (结构上的) features. This provides "strong evidence" that the success and rapid spread of flowering plants around the world is due to "genome downsizing".

By reducing the size of the genome, which is contained within the nucleus (核) of the cell, plants can build smaller cells. The researchers say genome-downsizing happened only in the angiosperms, and this was "a necessary condition for rapid growth rates among land plants".

1. What do we know about angiosperms? ______
A.They are superior in number among all living plant species.
B.They controlled the earth for hundreds of millions of years.
C.They challenge Charles Darwin's theory.
D.They are extinct plants in the world.
2. It can be implied that ______ .
A.Simonin works in the Royal Botanic Gardens Kew
B.Simonin is probably an American biologist
C.Darwin was confident of his theory of evolution
D.Darwin succeeded in figuring out the flower evolution
3. What contributed to the success and diversity of angiosperms? ______
A.The weaker ferns and conifer.
B.The larger nucleus.
C.The stronger cell.
D.The smaller genome.
4. What can be a suitable title of this passage? ______
A.Why were gymnosperms successful on earth?
B.What puzzle confused even Charles Darwin?
C.Why angiosperms dominated the earth?
D.When angiosperms outnumbered conifers and Ferns?

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阅读理解-七选五(约190词) | 适中 (0.65)
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【推荐1】Should We Create More National Parks

Don't you find it worrying that more and more species of animals are in real danger of becoming national parks extinct?     1    And I think the best way to do this is for governments to create more national parks.

    2    If this environment is destroyed-for example, when farmers clear a forest for new fields, or trees are cut down for making money, many animals are unable to survive, and more species are likely to become extinct.

In addition, national parks protect animals from the danger of being hunted. A major reason why many species are endangered is that the animals are killed by hunters. They hunt animals to make money.    3    

On the other hand, some people fight against the creation of national parks because they consider it wrong to interfere with nature. They believe that wild animals are happier living in their natural environment.    4    They also point out that a few species are more likely to produce young animals in the wild than in national parks.

All in all, these disadvantages are far less important than the benefits of national parks, because these parks allow animals to live in a safe environment.     5    

A.They say though the animals may face danger, they enjoy a free life.
B.Firstly, national parks protect the animals' natural environment.
C.To begin with, animals are important to humans.
D.I personally believe that we must save these animals.
E.There is a heated discussion about whether to create more national parks.
F.In fact, they protect animals from their greatest enemies--human beings.
G.Some hunters even hunt animals simply for sport.
2021-11-19更新 | 128次组卷
阅读理解-阅读单选(约360词) | 适中 (0.65)
文章大意:这是一篇说明文。作者主要介绍了软体动物逐渐消失这一现象、原因以及应对措施。

【推荐2】In 1973, when Melissa Greene was in 6th grade, her parents bought the first apartment on Hutchinson Island on the southeastern Atlantic cast. The first time she and her siblings ran down to the wild shore, they were shocked by the seashells there. Every tide left a wrack line of seashells. Today, on the same stretch of beach, she rarely finds the large, undamaged shells that were common in her childhood. “It’s a shocking difference,” she says, “what you don’t see any more are the deep piles of whole shells, quarter-sized and above, and the largest shells that we saw for years.”

Among the most admirable natural objects throughout human history, seashells contain both the surprise and wonder still promised by a trip to the beach and the profound changes underway on our coasts. Some of the largest and best-known marine mollusks (软体动物) have declined under fishing pressure. They are also harmed by rising ocean temperatures and acidifying waters and by other pollution. They can be reduced by the severe erosion-a persistent problem on Hutchinson Island.

With beaches seeing record tourism numbers, more people can mean fewer shells. “It is not as much individual collecting as the many ramifications of massive tourism,” says the paleo-biologist Michal Kowalewski at the Florida Museum of Natural History.“Mass tourism means more boats, more beach maintenance, more machinery, all contributing to changes in shorelines.”

Over twenty years ago, Sanibel became the first city in the U.S. to ban the practice of collecting and killing mollusks for their shells. Delaware’s state parks are among increasing numbers of state and national parks taking so-called low-impact beachcombing a step further: Asking visitors to leave empty shells alone, too. At Delaware Seashore State Park, signs advise visitors to “Leave shells where they lay or snap a photo of a marine critter in the sand. After all, the point of enjoying nature is because it is in a natural state.”

1. Why is the story of Melissa Greene mentioned in the first paragraph?
A.To introduce readers to an Atlantic coast.
B.To share Melissa’s attitude towards shells.
C.To show an ocean village’s development.
D.To lead in the topic of seashells’ disappearance.
2. How does the author state the reasons for the great decline of mollusks?
A.By comparing different conclusions.
B.By collecting the supporting data.
C.By listing the related factors.
D.By quoting the opinions of experts.
3. What does the underlined word ramifications in paragraph 3 mean?
A.Consequences.B.Industries.C.BranchesD.Benefits.
4. What is the last paragraph mainly about?
A.The common phenomenon of shell collecting.
B.Different measures taken to protect the seashells.
C.Future anticipation of seashells’ condition.
D.The effectiveness of bans on seashells’ development.
2023-04-08更新 | 115次组卷
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【推荐3】Hanukkah is an eight-day winter holiday, which celebrates the successful struggle of the Jews against King Antiochus IV Epiphanes of Syria. There are many traditions to celebrate the day, such as lighting the menorah (多连灯烛台),frying potato pancakes and spinning the dreidel (四面陀螺).
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"Do you smell something?" asked my husband, Donny. "Is something burning?" asked Molly, our oldest, age ten.
It was Ladybug! The fur on her left side had been burnt. She wasn't hurt, but she wore an upset expression all evening, and for the rest of the week she hid whenever we began chanting the Hebrew(希伯来语)blessings over the candles. "__________________________________________________________________________
The following year, for fifth-grade homework about family traditions, Molly wrote about Ladybug's story with the Hanukkah candles. The teacher, Lynn Fink, a sporty and funny woman, enjoyed Molly's story and gave it an A.
Three years later, Seth got Ms. Fink for fifth grade. He also worked the burnt cat fur into a writing assignment, and he, too, got an A.
Our son Lee, three years later: the same teacher, the same story, the same A. We had no idea these retellings were piling up.
The year Lily got Ms. Fink for fifth grade, she also felt inspired to write down what happened that night. By now, we were very fond of Ms. Fink. We invited her to join us for a night of Hanukkah. It was her first time to experience the Jewish holiday. Happily, she ate her potato pancakes. Gamely, she spun the dreidel. Delightedly, she opened the small gift of home-made cookies the children had prepared for her. As the evening seemed to be winding down, she clapped her hands, rubbed them together as if before a big dinner, and said excitedly," So! When do we torch the cat?"
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A.She was seriously hurt that night.
B.She broke the candles on the menorah.
C.She had some of her fur burnt.
D.She got a surprising present from the family.
2. What can we learn from the passage?
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2016-12-12更新 | 111次组卷
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