The African elephant, the largest land animal remaining on 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(栖息地).

    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.

Favorite Books for Kids

Dear Rose,

    My brother is often in a bad mood, which makes me in a bad mood. What should I do?

Jenny,

    It can be hard to be around someone who is in a bad mood. Since you can't change another person's mood, try to focus on what you can control: your own mood and reaction.

    You might find it easier to stay in a good mood if you leave your brother alone when he feels grumpy (脾气暴躁的). The next time he is in a bad mood, go to a quiet place in your house. Read, exercise, draw, listen to music — do something that makes you feel happy.

    Your parents might have some good suggestions for you, too.

Dear Rose,

   I play soccer, but sometimes I play badly. How can I do better? Jarom,

    To be good at anything, determination and practice are important. Listen closely to your coach, watch other players, then practice, practice, practice! Professional athletes continue to practice their sports each day, knowing that if they start to get lazy, they won't keep or develop their skills.

    In addition to practicing with teammates, you can work on drills on your own.

    Learning more about the sport may help too. Your coach can likely direct you to some good resources on skills development.

Dear Rose,

    I was moved up a grade a few years ago. Now, almost everyone in my previous grade asks me why. It wouldn't be a problem, except some boys ask over and over just to be annoying. What do I do?

Allison (by email)

    If you're sure that they are trying to be annoying, you might respond with something humorous. For example, you could say something like "They told me that the lunch lines would be shorter." Use the situation to turn annoying questions into something to laugh about.

    Last night Mr. and Mrs. Rojas stayed home. It was cold and rainy and they didn't want to go out in the bad weather. Mrs. Rojas made some popcorn and ice tea. At 8:00, Mr. and Mrs. Rojas went into the living room, sat on the sofa and began the movie and ate and drank. At 8:15, Mr. and Mrs. Rojas realized they already watched the movie last year and they didn't want to watch it again.

    “Now what?” asked Mr. Rojas. “Let's play cards!” answered Mrs. Rojas. At 8:30 Mr. and Mrs. Rojas started to play cards. They were playing for about 10 minutes when Mr. Rojas looked out the window. The rain changed to snow and the trees were covered in beautiful white snow. “I'm happy we stayed home tonight. It looks beautiful outside but this weather is very dangerous to drive in.” said Mr. Rojas. “You're right,” said Mrs. Rojas, “but I'm bored. Let's play some music and dance.”

    Mr. Rojas was surprised. “Dance? But I really don't ….”

    “Oh come on!” Mrs. Rojas insisted. She put on a romantic CD and they both started to dance. They were dancing for about 1 minute when suddenly the music stopped and the lights went out.  Mrs. Rojas laughed. “We're just not very lucky tonight, are we?” she said. Mr. Rojas said, “Of course we're lucky! We are together!” He kissed her and continued to dance with her, in the dark and without music.

    To be sure, only children experienced some things differently from those with sisters and brothers. Many feel more pressure to succeed. They also tend to look only to their parents as role models in the absence of brothers and sisters.

    In India, 10-year-old Saviraj Sankpal founded a support group for the tiny minority(少数) of only children. Among other things, the group does volunteer work to fight against the false idea that they are not responsible. "People think we're treated too kindly and ruined," says Sankpal, a computer engineering student. "But I'd like to remind them how lonely it can get."

    Most only children, however, say they wish for sisters or brothers only when it comes to caring for aging, unhealthy parents. Britain's David Emerson, co-author of the book The Only Child, says that such a person has to make all the decisions alone. Emerson knows from experience. After his father died, he chose to move his elderly mother from their family home, where she was vulnerable (易受攻击的) to house breakers, to a new one with more safety. "The move was quite hard on her, and she might feel that I pushed her into it, "he says, "After all, I am left with that responsibility."

    In the future, more and more only children will probably face similar choices. With working mothers increasing, many families are finding they simply don't have the time, money or energy to have more than one child. As only children become common, perhaps the world will realize that the charge made against them is unfair.

    Does your older brother think he's cleverer than you? Well, he's probably right. According to a new research published in the journal Intelligence, the oldest children in families are likely to have the highest IQs and the youngest the lowest.

    A number of studies have suggested that IQ scores decline with birth order. In the most recent study, at Vrije University, Amsterdam, researchers looked at men and women whose IQ had been tested at the ages of 5, 12, and 18.

    The results, which show a trend for the oldest to score better than the youngest in each test, involved about 200,000 people. That showed that first-borns had a three-point IQ advantage over the second-born, who was a point ahead of the next in line.

    The order of birth can also affect personality, achievement, and career, with first-borns being more academically successful and more likely to win Nobel prizes. However, eldest children are less likely to be radical(不同凡响的) and pioneering. Charles Darwin, for example, was the fifth child of six.

    Exactly why there should be such differences is not clear, and there are a number of theories on environmental influences on the child.

    The so-called dilution(稀释法) theory suggests that as family resources, both emotional and physical, as well as economic, are limited, it follows that, as a result , as more children come along, the levels of parental attention and encouragement will drop. Another theory is that the intellectual environment in the family favors the first-born who has, at least for some time, the benefit of individual care and help.

    The theory which enjoys the most support is that the extra time and patience that the earlier-borned get from their parents, compared with those arriving later, gives them an advantage.