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It was a village in India. The people were poor but they were happy. After all, their forefathers had lived in the same way for centuries. Then one day, some visitors from the city arrived. They told the villagers there were some people elsewhere who liked to eat frog. However, they did not have enough frogs of their own, and so they wanted to buy frogs from other places. This seemed like money for nothing. There were millions of frogs in the fields around, and they were useless to the villagers. What they had to do was to catch them. Agreement was reached, and the children were sent into the fields to catch frogs. Every week a truck arrived to collect the catch and hand over the money. The villagers were able to dream of a better future. But the dream didn’t last long. The change was hardly noticed at first, but it seemed as if the crops weren’t doing so well. More worry was that the children fell ill more often, and there were more insects around lately. The villagers decided that they couldn’t just wait to see the crops failing and the children getting weak. They would have to use the money earned to buy pesticides (杀剂) and medicine. Soon there was no money left. The people realized what was happening. It was the frog. They hadn’t been useless. They had been doing an important job--- eating insects. Now with so many frogs killed, the insects were increasing more rapidly. They were damaging the crops and spreading diseases. Now, the people are still poor. But in the evenings they sit in the village square and listen to sounds of insects and frogs. These sounds of the night now have a much deeper meaning. 小题1:From Paragraph l, we learn that the villagers_______. A.worked very hard for centuries B.dreamed of having a better life C.were poor but somewhat happy D.lived a different life from their forefathers 小题2:Why did the villagers agree to sell frogs? A.The frogs were easy money. B.They needed money to buy medicine. C.They wanted to please the visitors. D.The frogs made too much noise. 小题3: What might be the cause of the children’s sickness? A.The crops didn’t do well. B.There were too many insects. C.The visitors brought in diseases. D.The pesticides were overused. 小题4:What is meaning of the last sentence of the article? A.Happiness comes from peaceful life in the country. B.Money is important. C.The harmony between man and nature is important. D.Good old days will never be forgotten.
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参考答案:
举一反三
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A.
逆变器将直流电转变为交流电
B.
直到用户要求时变压器才存储电压
C.
整流器将交流电转变为直流电。
D.
使用逆变器设备的优势是它完全自动化。
【单选题】对于p型半导体,费米能级随受主杂质掺杂浓度的变化情况为?
A.
费米能级随掺杂浓度的增加向 价带顶 移动
B.
费米能级随掺杂浓度的增加向 导带底 移动
C.
费米能级随掺杂浓度的增加向 禁带中线 移动
D.
费米能级随掺杂浓度的增加向 施主能级 移动
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A.
正确
B.
错误
【单选题】对于p型半导体,费米能级随掺杂浓度的变化情况为?
A.
费米能级随掺杂浓度的增加向 价带顶 移动
B.
费米能级随掺杂浓度的增加向 导带底 移动
C.
费米能级随掺杂浓度的增加向 禁带中线 移动
D.
费米能级随掺杂浓度的增加向 施主能级 移动
【单选题】要设置幻灯片中对象的动画效果以及动画的出现方式,应在( )中进行.
A.
切换
B.
动画
C.
设计
D.
审阅
【单选题】对于p型半导体,费米能级随掺杂浓度的变化情况为:
A.
费米能级随掺杂浓度的增加向禁带中线移动
B.
费米能级随掺杂浓度的增加向价带顶移动
C.
费米能级随掺杂浓度的增加向导带底移动
D.
费米能级随掺杂浓度的增加向施主能级移动
【单选题】了解被审计单位及其环境一般在( )进行。
A.
在承接客户和续约时
B.
在进行审计计划时
C.
在进行期中审计时
D.
贯穿于整个审计过程的始终
【单选题】硅酸盐水泥熟料中对强度贡献最大的是_____。
A.
C3A
B.
C3S
C.
C4AF
D.
石膏
【单选题】硅酸盐水泥中,对强度贡献最大的熟料矿物是( )。
A.
C3S
B.
C2 S
C.
C3A
D.
C4AF
【单选题】清单91:以下关于计日工的说法正确的是 (   )
A.
计日工只包含零星工作中的人工消耗工作量
B.
计日工的数量,单价均由招标人统一规定。
C.
在施工过程中,承包人完成发包人提出的施工图纸以外的零星项目或工作,按合同中约定的综合单价计价的一一种方式。
D.
计日工是为了解决现场发生的零星工作的计价而设立的,对完成零星工作所消耗的人工工日、材料品种与数量、施工机械台班进行计量,并按照计日工表中填报适用项目的单价进行计价和支付。
E.
计日工适用的所谓零星工作一般是指合同约定以外或者因变更  而产生的而工程量清单中没有相应项目的额外工作,尤其是那些不允许事先商定价格的额外工作。
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