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Long before Barack Obama became president of the United States, he wrote a book(call) Dream from My Father: A Story of Race and Inheritance, which has since becomebestseller. It is an(appeal) book that includes what he went through during(he) childhood. Obama has little contact with his fatherroots were in Kenya because he left home when Obama was very young. His mother got marrieda student from Indonesia shortly after the family moved to Jakarta. A few years later, Obama came back with his grandparents to Hawaii, where he(attend) a private high school. (study) at Columbia in New York City, he then entered Harvard Law School. This autobiography also touches(heavy) on Obama's exposure to racism. Readers will find his reflections of childhood (experience) which involved racial discrimination to be especially moving.
→Unfortunately, she while she was doing some shopping.
For thousands of years, people have tried to control water by building dams. Dams allow people to collect and store water for use at home, in industry, and in agriculture. For example, when people build a dam on a river, a reservoir(水库) collects water that can be channelled for human needs. In addition, the ability of dams to control water flow helps prevent floods. Dams can also be used to make electricity.
As the human population grows, the need for water and electricity increases. So many new dams have been built in the past 50 years. Today, nearly half of the rivers in the world have at least one large dam. If managed well, dams can be a great benefit to people. Some dams, however, may do more harm than good.
All dams cause changes in river ecosystem that has an impact on surrounding land and people. As river water collects behind a large dam, it may back up and form a large lake, flooding land and killing plants and animals. People living on land upstream of a dam may be forced to abandon their homes. Below the dam, water flow decreases. This changes the downstream ecosystem. Plants and animals may not have enough water. Some types of fish may be unable to move upstream to reproduce. Rare species of plants and animals may become endangered. Farmers living downstream from the dam may not be able to grow crops. People who fish for a living may have to find other work.
An independent organization called World Commission on Dams worked during the late 1990s to suggest ways of reducing problems caused by some large dams. The commission recommended that the research, the group decision-making, and the creation of a plan all take place before the start of construction of a large dam. For a plan to be successful, it would need to demonstrate that the dam would contribute to the long-term improvement of human life. The likely impact of the dam on local people and the environment would be assessed and considered in the decision-making process.
结果，孩子们变得太依赖于他们的父母，以至于他们没有独立的思想和创造性的想法。
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be linked to; work together; as well; refer to; for convenience; break away from |
