From the passage, we know the reason why around 10% of people are left-handed is that . A——青夏教育精英家教网—

摘要： From the passage, we know the reason why around 10% of people are left-handed is that . A. their frontal lobe is usually dominant B. their temporal lobe is usually dominant C. their right brain is usually dominant D. their left brain is usually dominant 答案 68.B 69.A 70.C Passage 43 The African elephant, the largest land animal remaining on earth , is of great importance to African ecosystem. 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-savannasurroundings 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. 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.

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Thinking

·Some scientists claim that we humans are the only living things that are conscious(有意识的)—we alone are aware that we are thinking.

·No one knows how consciousness works—it is one of science’s last great mysteries.

·All your thoughts take place in the cerebrum(大脑皮质),which is at the top of your brain,and different kinds of thought are linked to different areas,called association areas.

·Each half of the cerebrum has four rounded ends called lobes(脑叶)—two at the front(frontal and temporal lobes)and two at the back(occipital and parietal lobes).

·The frontal lobe is linked to your personality and it is where you have your bright ideas.

·The temporal lobe is where you hear and understand what people say to you.

·The occipital lobe is where you work out what your eyes see.

·The parietal lobe is where you record touch,heat and cold,and pain.

·The left half of the brain controls the right side of the body.The right half controls the left side.

·One half of the brain is always dominant(in charge).Usually,the left brain is dominant,which is why 90% of people are right-handed.

Which part of your cerebrum is most active when you are making a telephone call?

A.The frontal lobe. B.The temporal lobe.

C.The occipital lobe. D.The parietal lobe.

Which of the following statements is true?

A.One’s personality has something to do with the frontal lobe.

B.Bright ideas come from the parietal lobe.

C.The occipital and temperal lobes are at the back of the cerebrum.

D.The occipital lobe is in charge of sound.

From the passage,we know the reason why around 10% of people are left-handed is that_______.

A.their frontal lobe is usually dominant

B.their temporal lobe is usually dominant

C.their right brain is usually dominant

D.their left brain is usually dominant

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