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【简答题】
Edward rose early on the New-year morning. He looked in every room and wished a Happy New Year to his family. Then he ran into the street to repeat that to those he might meet. When he came back, his father gave him two bright, new silver dollars. His face lighted up as he took them. He had wished for a long time to buy some pretty books that he had seen at the bookstore. He left the house with a light heart, expecting to buy the books. As he ran down the street, he saw a poor family. “I wish you a Happy New Year.” said Edward, as he was passing on. The man shook his head. “You are not from this country.” said Edward. The man again shook his head, for he could not understand or speak his language. But he pointed to his mouth and to the children shaking with cold, as if (好像) to say, “These little ones have had nothing to eat for a long time.” Edward quickly understood that these poor people were in trouble. He took out his dollars and gave one to the man, and the other to his wife. They were excited and said something in their language, which doubtless meant, “We thank you so much that we will remember you all the time.” When Edward came home, his father asked what books he had bought. He hung his head a moment, but quickly looked up. “I have bought no books”, said he. “I gave my money to some poor people, who seemed to be very hungry then.” He went on, “I think I can wait for my books till next New Year.” “My dear boy,” said his father, “here are some books for you, more as a prize for your goodness of heart than as a New-year gift” “I saw you give the money cheerfully to the poor German family. It was nice for a little boy to do so. Be always ready to help others and every year of your life will be to you a Happy New Year.”
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【单选题】In 2012 a severe drought raised the price of corn. For a farmer in Canada who harvested a normal crop because the farm was not affected directly by the drought, the increase in the price of corn (201...
A.
increases the farmer's producer surplus.增加农民生产者剩余。
B.
decreases the farmer's producer surplus.减少农民生产者剩余。
C.
does not affect the producer surplus because this change is a movement along the farmer's supply curve and not a shift of the farmer's supply curve.不影响生产者剩余,因为这种变化是沿着农民供给曲线的运动,而不是农民供应曲线的转变。
D.
increases producer surplus only if the farmer's supply is completely inelastic.只有农民的供给完全没有弹性,才能增加生产者的剩余。
【单选题】【单选】 采用PID调节器的温度定值控制系统受到扰动作用后,若温度的最大动态偏差emax偏大,其原因可能是调节器的 ___( )__ 。
A.
比例带调得偏大、微分时间调得偏小
B.
积分时间和微分时间都调得偏大
C.
比例带和积分时间都调得偏小
D.
比例带和微分时间都调得偏小
【单选题】下列哪项一般不是肝硬化引起门脉高压的原因
A.
纤维组织压迫中央静脉
B.
门脉静脉与肝动脉之间形成异常吻合支
C.
血管床减少
D.
肝动脉与肝静脉之间形成异常吻合支
E.
假小叶压迫小叶下静脉
【单选题】The worst drought in over 50 years has decimated crops of soy beans and corn in the United States. (Source: New York Times, August 10, 2012). Because the production of corn has decreased, prices are e...
A.
percentage increase in income.收入增长百分比
B.
percentage increase in quantity.数量增加百分比。
C.
percentage decrease in quantity.数量减少百分比。
D.
increase in bushels per acre.蒲公英每英亩增加
【简答题】公交车曾是中国人出行的主要交通工具。 Buses ____1____ be the main ___2____ of transportation for Chinese people. 近年来,由于私家车数量不断增多,城市的交通问题越来越严重。 In recent years, traffic problems in cities are getting worse because of the...
【多选题】英国等西方列强通过一系列不平等条约,在中国攫取了大量的侵略特权包括:
A.
协定关税,破坏中国的关税主权
B.
外国船舰可以在中国领海自由航行
C.
外国人在华不受中国法律的约束,享受领事裁判权
D.
割占香港岛,破坏了中国的主权和领土完整
【单选题】若y随着x的变化而等比例变化,则y与x的关系是______。
A.
单相关    
B.
线性相关    
C.
非线性相关  
D.
复相关
【单选题】The isolation of the rural world because of distance and the lack of transport facilities is compounded by the paucity of the information media. 最合适的译文是 ______ 。
A.
农村社会因为距离所产生的隔绝以及缺乏交通工具,通讯工具不足混合起来
B.
农村世界由于距离而产生隔绝,而且也缺乏交通工具,加之通讯工具不足,情况变得更加严重
C.
因为距离远,又缺乏交通工具,农村社会是与外界隔绝的。这种隔绝状态,由于通讯工具不足,就变得更加严重了
D.
孤立的农村世界的距离,因为缺乏新闻媒体,缺乏运输设施是复杂的
【单选题】回归系数与相关系数的符号是一致的,其符号均可用来判断现象是(    )。
A.
正相关还是负相关    
B.
线性相关还是非线性相关
C.
单相关还是复相关    
D.
完全相关还是不完全相关
【单选题】下列有关样本相关系数的说法不正确的是
A.
相关系数用来衡量变量 与 之间的线性相关程度
B.
,且 越接近于1,相关程度越大
C.
,且 越接近于0,相关程度越小
D.
,且 越接近于1,相关程度越大
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