题目内容
Unlike modern animal scientists, dinosaur scientists cannot sit on a hillside and use telescopes to watch dinosaurs in order to know how they lived and whether they were good parents. Instead, they have to search hard for dinosaurs died out millions of years ago.
It’s very difficult for the scientists to reach an agreement because different results can be got from the same fossils. Many fossils of the same kind of dinosaurs have been dug out from one place. They might have formed when an entire group of dinosaurs got stuck all at once. Or they might have been the result of dinosaurs getting stuck one after another over a course of a few centuries. Thus we can say that dinosaurs might have in the first case lived in big groups and in the second lived alone.
Though there are two different results, dinosaur scientists now generally agree that at least some kinds of dinosaurs lived in big groups. “That’s pretty much settled at this point.” Says Paul Sereno. A kind of dinosaurs called Sauropods left behind tracks in the western United States that appear to run north and south, suggesting that they even moved long distances together.
As to whether dinosaurs cared for their young, dinosaur scientists have turned to the closest living relatives of dinosaurs-birds and crocodiles – for possible models, Birds give a lot of care to their young, while crocodiles just help their young to the water. The discovered fossils of dinosaurs sitting on their eggs and staying with their young suggest the parents were taking care of their babies, but we still cannot say that all dinosaurs did the same.
There is still a long way to go before the above questions could be answered. Dinosaur scientists will have to find more proof to reach an agreement.
1. Dinosaur scientists can get information directly by ______.
A. studying dinosaur fossils B. examining modern animals
C. watching dinosaurs D. using telescopes
2. What is pretty much settled according to Paul Sereno?
A. Half of the dinosaurs lived alone. B. Most dinosaurs moved long distance.
C. Many dinosaurs settled in the north. D. Some dinosaurs lived in big groups.
3. Dinosaur scientists can probably know whether dinosaurs were good parents by ____.
A. watching many kinds living relatives B. studying dinosaurs’ living relatives
C. watching birds flying D. working hard in labs
4. Which of the following is TRUE according to the paragraph?
A. Birds hardly pay attention to their young.
B. Baby crocodiles can look after themselves well.
C. Some dinosaurs took care of their young.
D. Birds and crocodiles take good care of their young.
A
D
B
C
【解析】
期末100分闯关海淀考王系列答案
小学能力测试卷系列答案The African elephant, the largest land animal remaining on the earth, is of great importance to African ecosystem(生态系统). Unlike other animals, the African elephant is to a great extent the builder of its environment. As a big plant-eater, it largely shapes the forest-and-savanna(大草原) surroundings in which it lives, therefore setting the terms of existence for millions of other animals that live in its habitat.
It is the elephant’s great desire for food that makes it a disturber of the environment and an important builder of its habitat. In its continuous search for the 300 pounds of plants it must have every day, it kills small trees and underbushes, and pulls branches off big trees. This results in numerous open spaces in both deep tropical forests and in the woodlands that cover part of the African savannas(热带草原). In these open spaces are numerous plants in various stages of growth that attract a variety of other plant-eaters.
Take the rain forests for example. In their natural state, the spreading branches overhead shut out sunlight and prevent the growth of plants on the forest floor. By pulling down trees and eating plants, elephants make open spaces, allowing new plants to grow on the forest floor. In such situations, the forests become suitable for large hoofed plant-eaters to move around and for small plant-eaters to get their food as well.
What worries scientists now is that the African elephant has become an endangered species. If the elephant disappears, scientists say, many other animals will also disappear from vast areas of forest and savanna, greatly changing and worsening the whole ecosystem.
1.What is the passage mainly about?
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A．Disappearance of African elephants. |
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B．Forests and savannas as habitats for African elephants. |
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C．The effect of African elephants’ search for food. |
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D．The eating habit of African elephants. |
2.What does the underlined phrase “setting the terms” most probably mean?
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A．Fixing the time. |
B．Worsening the state. |
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C．Improving the quality. |
D．Deciding the conditions. |
3.According to the passage, which of the following statements is TRUE?
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A．The African elephant is the largest animal on the earth. |
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B．African elephants have 300 pounds of plants every day, including small trees and underbushes. |
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C．The African elephant is in a way the builder of the environment like other land animals. |
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D．If the African elephant disappears, the whole ecosystem won’t be affected. |
4.The passage is developed mainly by .
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A．showing the effect and then explaining the causes |
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B．pointing out similarities and differences |
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C．describing the changes in space order |
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D．giving examples |