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请结合给定资料，以“农业之依”为题，写一篇议论文。
要求：1．主旨明确，内容充实，论述深刻。
2．结构完整，条理清晰，语言流畅。
3．字数1000～1200字。

A.主旨明确，内容充实，论述深刻。
B.结构完整，条理清晰，语言流畅。
C.字数1000～1200字。


【参考答案】

农业之依 ——强化政府职责加强农业水利建设 毛泽东同志曾经说过“水利是农业的命脉”。水利建设不仅对保证我国农业发展、保证......

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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 heartbeat 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.16. We can learn a lot by observing the position in which a mother holds her baby against her body.A．RightB．WrongC．Not mentioned
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A．Right
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单项选择题
High Stress May Damage Memory According to a report issued in May 1998, elderly people who have consistently high blood levels of cortisol don’t score as well on memory tests as their peers with lower levels of the stress hormone. What’s more, high levels of cortisol are also associated with shrinking of the hippocampus, a region of the brain that plays a key role in learning and memory. The findings suggest that even cortisol levels in the normal, 'healthy' range can actually accelerate brain aging. The study results 'now provide substantial evidence that long-term exposure to adrenal stress hormones may promote hippocampal aging in normal elderly humans,' write Nada Porter and Philip Land- field of the University of Kentucky in Lexington in their editorial. Cortisol is a hormone released in response to stress by the adrenal glands ,which sit on top of the kidneys. Over a 5 to 6-year period ,Dr. Sonia Lupien and his colleagues measured 24-hour cortisol levels in 51 healthy volunteers ,most of whom were in their 70s. Despite wide variation in cortisol levels, the participants could be divided into three subgroups, those whose cortisol progressively increased over time and was currently high (increasing high); those whose cortisol progressively increased over time and was currently moderate (increasing moderate); and subjects whose cortisol decreased, but was currently moderate (decreasing moderate). The researchers tested the volunteers' memory on six people in the increasing high category and five people in the decreasing moderate group. The groups did not differ on tests of immediate memory, but the increasing high cortisol group had other memory problems compared with those in the decreasing moderate group. The researchers also found that the total, volume of the hippocampus in those in the increasing high group was 14 % lower than those in the decreasing moderate group, although there were no differences in other brain regions. The results suggest that '... brain aging can be accelerated by levels of adrenal hormones that are not generally regarded as pathological and that variation within, this normal range is related to variation in the rate of brain aging,' write Porter and Landfield. 'This further, suggests that chronic stress may accelerate the worsening of hippocampus. '31. The part of the brain important for a person's learning, and memory isA．the cortisol.B．the adrenal glands.C．the stress hormones.D．the hippocampus.
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I.the
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D．the
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