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1. "I don't like being in the house on my own.""______ at night? Do you mind being by yourself at night?"A. What aboutB. What withC. What ifD. So what2. He came back late, _______ which time all the guests had already left.A. afterB. atC. byD. during3. ______ money from his department, Mr. Williams would have been promoted to the position as director.A. If he did not stealB. Had he not stolenC. Did he not stealD. Should he not steal4. _______ it was on the side of a mountain, the village was very quiet.A. Isolated asB. Isolating ifC. Being isolated asD. Having been isolated if5. I hope all the measures against air pollution, _______ suggested by the local government, will be seriously considered here.A. whileB. sinceC. thatD. as6. Students of _______ grades are those studying in the first three grades of elementary school.A. entryB. basicC. mainD. primary7. The museum is _______ a valuable group of coins.A. displayingB. exhibitingC. presentingD. giving8. Many cookbooks have very ______ directions.A. commonB. confirmedC. complicatedD. compound9. The ______ for speeding is a fine of one hundred and fifty dollars.A. penaltyB. benefitC. criticismD. remedy10. The two brothers are very much _____, not only in appearance but also in thinking.A. likeB. likelyC. alikeD. alive11. The Great Wall winds its way ________ the mountains.A. throughB. acrossC. pastD. behind12. These areas rely on agriculture almost ___________, having few mineral resources and a minimum of industrial development.A. respectivelyB. relativelyC. incrediblyD. exclusively13. A ______ slowing in reaction time will occur if a senior doesn't stay active.A. uniqueB. obviousC. beautifulD. striking14. The survival _____________ of some wild animals is not very high as they are often killed for their skins.A. rateB. degreeC. ratioD. scale15. From this material we can __________ hundreds of useful products.A. deriveB. reduceC. employD. replace16. The judge considers a financial ____________ to be an appropriate way of punishing him.A. optionB. dutyC. responsibilityD. penalty17. His grandfather is still ________ and lively, full of energy.A. vigorousB. violentC. intenseD. high-impact18. We are all for your proposal that the discussion ________.A. was put offB. is to put offC. be put offD. should put off19. Frequently single-parent children _______ some of the housework.A. take offB. take afterC. take onD. take in20. He'll be angry if you try to ______ him. He is very busy now.A. interfere withB. interfere inC. disturb withD. worry about

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(判断题)在回归分析中,可用残差图判断模型的拟合效果,残差点比较均匀地落在水平的带状区域中,说明这样的模型比较合适.带状区域的宽度越窄,说明模型的拟合精度越高。

A. 对
B. 错

(单选题)在一元线性回归方程y=a+bX中,回归系数 表示()。

A. 当X=0时,y的期望值
B. 当X变动1个单位时,y的变动总额
C. 当y变动1个单位时,X的平均变动额
D. 当X变动1个单位时,y的平均变动额

(单选题)产品的产量X(千件)与单位产品成本y (元)之间的回归方程为y=110-6.57X,这意味着产量每提高一个单位(千件),成本平均()。

A. 提高110元
B. 降低110元
C. 降低6.57元
D. 提高6.57元

(单选题)下列直线回归方程中,肯定错误的是()。

A. yc=2+3X,r=0.88
B.yc=4+5X,r=0.55
C. yc=-10+5X,R=-0.90
D. yc=-100-0.9X,r=-0.83

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