70.Which of the following is true of the author?

　　A. He got no access to success.

　　B. He wrote back to his father at 12.

　　C. He was sure his parents loved him.

　　D. He once asked his father about the letter.

　　71.The main purpose of the text is to _______.

　　A. describe children’s thinking

　　B. answer some questions children have

　　C. stress the importance of communication

　　D. advise parents to encourage their children

　　E

　　 The need to feed a growing population is putting much pressure on the world’s supply of water. With 97% of the world’s water too salty to salty to be drunk or be drunk or used in agriculture, the worldwide Supply of water needs careful management, especially in agriculture, Although the idea of a water shortage(短缺)seems strange to someone fortunate enough to live in a high rainfall country, many of the world’s agricultural industries experience constant water shortages .

　　Although dams can be built to store water for agricultural use in dry areas and dry seasons, the costs of water redistribution(重新分配) are very high. Not only is there the cost of the engineering itself ,but there is also an environmental cost to be considered .Where valleys(山谷) are flooded to create dams, houses are lost and wildlife homes destroyed . Besides , water may flow easily through pipes to fields, but it cannot be transported from one side of the world to the other. Each country must therefore rely on the management of its own water to supply its farming requirements.

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