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Explorers started making navigation (导航) charts showing how wide the ocean was more than 500 years ago. But it’s much harder to calculate how deep it is.

In 1872 the HMS Challenger, a British Navy ship, set sail to learn about the ocean, including its depth. It carried 181 miles (291 kilometers) of rope to measure the depth of the ocean. During their four-year voyage, the Challenger crew collected samples of rocks, mud and animals from many different areas of the ocean. They also found one of the deepest zones, in the western Pacific, the Mariana Trench which stretches for 1,580 miles (2,540 kilometers).

Today scientists know that on average the ocean is 2.3 miles (3.7 kilometers) deep, but many parts are much shallower or deeper. To measure depth they use sonar, which stands for Sound Navigation And Ranging. A ship sends out pulses of sound energy and measures depth based on how quickly the sound travels back.

Ocean scientists like me study the sea floor because it helps us better measure the ocean. Our planet’s outer, layer is made of tectonic plates. The Hawaiian-Emperor Seamount chain, a line of peaks on the ocean floor, was created when a tectonic plate moved over a spot where hot rock welled up from deep inside the Earth. When two tectonic plates move away from each other underwater, new material rises up into Earths layer. This process, which creates new ocean floor, is called seafloor spreading. Sometimes super-hot liquids from inside the Earth shoot up through cracks in the ocean floor called hydrothermal vents.

Amazing fish, shellfish, tube worms and other life forms live in these zones. Between the creation and destruction of ocean plates, sediments (沉淀物) collect on the sea floor and provide an archive of Earth’s history, the evolution of climate and life that is available nowhere else.

【小题1】Why did the HMS Challenger make the voyage?
A.To test navigation.B.To calculate the age of the ocean.
C.To explore the ocean.D.To do research into Mariana Trench.
【小题2】How do scientists know the depth of the ocean?
A.By measuring it with ropes.
B.By studying samples of rocks and mud.
C.By analyzing the habitats of the animals.
D.By studying the returning speed of the sound.
【小题3】What is the fourth paragraph mainly about?
A.Certain changes of the sea floor.
B.The layers that make up the Earth.
C.The way that a volcano comes into being.
D.Some definitions of the seafloor spreading.
【小题4】What can be a suitable title for the text?
A.How Deep Is the Ocean?B.How Is the Ocean Studied?
C.Ocean: An Unknown WorldD.Nature: A Place for Wildlife
19-20高三下·云南昆明·阶段练习
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Built in 1990, the Moriyama City Firefly Forest Museum has been trying to recover the number of the Genji firefly (源氏萤火虫), whose population was near extinction in the first half of the 20th century.

In Japan, fireflies have long been the sign of summer. Moriyama’s Genji fireflies were especially prized for their vivid, yellow-green glow. However, from 1868 to 1912, a commercial firefly industry developed. In just one night, a single hunter could catch about as many as 3,000 fireflies, sweeping the earth with brushes to frighten just egg-laying fireflies from riverbanks. It was easiest to catch female fireflies when they laid their eggs. Thus, there were fewer and fewer left to produce the next generation. At the same time, a fast-urbanizing Japan was turning Moriyama’s once ideal habitats into places where few fireflies could survive. Concrete was laid on the banks where there was once grass. Wastewater ran into the waters where the larvae (幼虫) grew.

The founders set its museum in the kind of habitat that Genji fireflies would find attractive. They created an artificial river and planted its banks with grass. Inside the museum, they mate and reproduce Genji fireflies; it is still the only organization to do so in a large size. Fireflies lay thousands of eggs. When the larvae come out, they are moved to boxes with flowing water. They grow there until February when the larvae are moved to the man-made river. Then, the fireflies leave the water and take flight in June.

The museum also has educational purpose. Throughout the year, it lectures on the insect’s history and ecology in schools. They also lead museum activities and other training and awareness campaigns, including the museum’s magazine, From the Firefly Forest. Cleanup activities around waters are also organized.

The action is reasonable but, despite their efforts, the number of Genji fireflies hasn’t increased so much in Moriyama. Most other habitats continue to become worse due to urbanization. Unless people preserve them, fireflies will continue to suffer. “The only chance at recovering Genji firefly populations is to act now,” ecologist Kato warns. “We’re running out of time to provide the environmental education to save Japan’s beloved insect.”

【小题1】Why did the number of the Genji fireflies decrease?
A.Because the banks where they once lived disappeared.
B.Because the waters where the larvae grew were polluted.
C.Because over 3,000 female fireflies were caught every night.
D.Because a commercial firefly industry developed their habitats.
【小题2】What efforts has the Firefly Forest Museum made?
A.It has organized various educational activities.
B.It has helped Genji fireflies lay thousands of eggs.
C.It has helped Genji fireflies leave the water and take flight in June.
D.It has created the kind of habitat that the Genji fireflies would find attractive.
【小题3】What does Kato think of the task of recovering the Genji fireflies population?
A.It is reasonable.B.It makes no sense.
C.It wastes lots of time.D.It needs immediate action.
【小题4】What is the text mainly about?
A.The extinction of Genji fireflies in Japan.
B.The reappearance of Genji fireflies in Japan.
C.Efforts made to recover Genji fireflies by a Japanese museum.
D.The effect of urbanization on Japan’s favorite glowing insect.

Most young people enjoy some form of physical activity. It may be walking, cycling or swimming, or winter, skating or skiing. It may be a game of some form---football, hockey, golf or tennis. It may be mountaineering.

Those who have a passion for climbing high and difficult mountains are often looked upon with surprise. Why are men and women willing to suffer cold and hardship, and to take risks on high mountains? This astonishment is caused, probably, by the difference between mountaineering and other forms of activity to which men give their leisure.

Mountaineering is a sport and not a game. There are no man-made rules, as others, as there are for such games as golf and football. There are, of course, rules of a different kinds which would be dangerous to ignore, but it is this freedom from man-made rules that makes mountaineering attractive to many people. Those who climb mountains are free to use their own methods.

If we compare mountaineering with other more familiar sports, we might think that one big difference is that mountaineering is not a “team game”. We should be mistaken in this. There are, it is true, no “matches” between “teams” of climbers, but when climbers are on a rock face linked by a rope on which their lives may depend, there is obviously teamwork.

The mountain climber knows that he may have to fight forces that are stronger and more powerful than man. He has to fight the forces of nature. His sport requires high mental and physical qualities

A mountain climber continues to improve in skill year after year. A skier is probably past his best by the age of thirty. But it is not unusual for men of fifty or sixty to climb the highest mountains in the Alps. They may take more time than younger men, but they perhaps climb with more skill and less waste of efforts, and they certainly experience equal enjoyment.

【小题1】Mountaineering is a sport, not a game because______
A.there is not certain rule for climbers to follow
B.it is too dangerous for climbers
C.it can’t bring people joy and leisure
D.it has man-made rules
【小题2】According to the writer, the only enemy of mountaineer should be______
A.temperatureB.nature
C.climateD.patience
【小题3】The underlined word “passion” in Paragraph 2 could be replaced by______
A.enthusiasmB.taste
C.giftD.strength

When I was six, Dad brought home a dog one day, who was called “Brownie”. My brothers and I all loved Brownie and did different things with her. One of us would walk her, another would feed her, and then there were baths, playing catch and many other games. Brownie, in return, loved each and every one of us. One thing that most touched my heart was that she would go to whoever was sick and just be with them. We always felt better when she was around.

One day, as I was getting her food, she chewed up (咬破) one of Dad’s shoes, which had to be thrown away in the end. I knew Dad would be mad and I had to let her know what she did was wrong. When I looked at her and said, “Bad girl.” She looked down at the ground and then went and hid. I saw a tear in her eyes.

Brownie turned out to be more than just our family pet. She went everywhere with us. People would stop and ask if they could pet her. Of course, she’d let anyone pet her. She was just the most lovable dog. There were many times when we’d be out walking and a small child would come over and pull on her hair. She never barked (吠) or tried to get away. Funny thing is she would smile. This frightened people because they thought she was showing her teeth. Far from the truth, she loved everyone.

Now many years have passed since Brownie died of old age. I still miss the days when she was with us.

【小题1】What would Brownie do when someone was ill in the family?
A.Keep them company.B.Look at them sadly.
C.Play games with them.D.Touch them gently.
【小题2】We can infer from Paragraph 2 that Brownie           .
A.would eat anything when hungryB.loved playing hide-and-seek
C.felt sorry for herselfD.disliked the author’s dad
【小题3】Why does the author say that Brownie was more than just a family pet in Paragraph 3?
A.She was treated as a member of the family.
B.She played games with anyone she liked.
C.She was very popular in the community.
D.She went everywhere with the family.
【小题4】Which of the following best describes Brownie?
A.Caring.B.Annoying.C.Brave.D.Curious.

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