题目内容
In ancient times, man settled near rivers or on river banks and built up large empires and civilizations. Rome today still stands on both sides of the Tiber. The Menam runs through modern Bangkok, still serving as a great waterway for the transport of goods and people.
Water is Nature's most precious gift to man. Man needs water to irrigate his crops, to cook and to wash. In nations far and wide rivers means life and wealth. The Irrawady, Nile, Gangas and a host of other feed and clothe the nation around them. A shortage of water in heavily populated agricultural areas will cause great hardship and starvation as crops fail.
Water is also a source of energy and power. Man constructs huge dams across rivers to control the water for irrigation and obtain the energy needed to drive generators. The electrical power is then channeled to homes, cities factories, television stations and the military.
Man uses billions of liters of water each day. His main source of water comes from reservoirs which in turn obtain their water from the rivers.
Rivers have been important to man ______.
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An Observation and an Explanation
It is worth looking at one or two aspects of the way a mother behaves towards her baby. The usual fondling, cuddling and cleaning require little comment, but the position in which she holds the baby against her body when resting is rather revealing. Careful studies have shown the fact that 80 percent of mothers hold their infants in their left arms, holding them against the left side of their bodies. If asked to explain the significance of this preference most people reply that it is obviously the result of the predominance of right-handedness in the population. By holding the babies in their left arms, the mothers keep their dominant arm free for manipulations. But a detailed analysis shows that this is not the case. True, there is a slight difference between right-handed and left-handed females; but not enough to provide adequate explanation. It emerges that 83 percent of right-handed mothers hold the baby on the left side, but so do 78 percent of left-handed mothers. In other words, only 22 percent of the left-handed mothers have their dominant hands free for actions. Clearly there must be some other, less obvious explanation.
The only other clue comes from the fact that the heart is on the side of the mother's body. Could it be that the sound of her heart beat is the vital factor？ And in What way？ Thinking along these lines it was argued that perhaps during its existence inside the body of the mother the unborn baby get used to the sound of the heart beat. If this is so, then the re-discovery of this familiar sound after birth might have a claiming effect on the infant, especially as it has just been born into a strange and frighteningly new world, if this is so then the mother would, somehow, soon arrive at the discovery that her baby is more at peace if held on the left against her heart than on the right.
We can learn a lot by observing the position in which a mother holds her baby against her body.
A．biologicalB．physicalC．mentalD．portable
听力原文：M: I'm afraid I didn't earth what Dr. Brown was saying just now.
W: He told us to hand in the lab report a week later.
Q: When should the two speakers hand in their report？
(4)
【S4】
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