若大豆的需求弹性系数为0.2，在其他条件不变的情况下，关于大豆价格和需求量的说法，正确的有()。
A.大豆价格上涨1%，则大豆需求下降0.2%
B.大豆价格下降1%，则大豆需求增加0.2%
C.大豆价格上涨1元，则大豆需求量下降20%
D.大豆价格上涨1元，则大豆需求下降20%
E.大豆价格上涨0.1%，则大豆需求下降2%
参考答案：A, B
解析：本题考查第五章农产品需求弹性的含义，需求弹性为农产品需求量对农产品价格变动的反应程度，需求弹性系数=需求数量变动的百分比/农产品价格变动的百分比，表示农产品价格没变动1%，农产品需求量变工的百分比。
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| When I was young, I was very embarrassed (尴尬) to be seen with my father. He was disabled and very short, and he 1 with great difficulty. When we walked together, with his hand on my arm for balance, people would 2 . I would be nervous about the unwanted 3 . It was 4 for us to walk in step, and because of that, we didn't say much as we went 5 But as we started out, he always said," You set the pace (步幅). I will try to follow you." Our usual walk was to or from the subway, which was how he got to work. He never missed a day, and would 6 it to the office even if others could not. He 7 talked about himself as an unhappy man, nor did he show any envy (嫉妒) of the more fortunate or able. What he 8 in others was a "good heart," 9 if he found one, the owner was good enough for him. He has been gone many years now. I wonder if he felt I didn't 10 to be seen with him during our walks. If he did, I am sorry I never told him how 11 I was. I think of him when I complain about life, when I envy another's good fortune, and when I don't have a "good heart". At such times I put my hand on his arm to get back my 12 , and say, "You set the pace. I will try to follow you." | ||||
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