26. Although Jane agrees with me on most points, there was one on which she was unwilling to _______.
A. give out B. give in C. give away D. give off
25. In my childhood, I was often ________ by Mother to mind my behavior.
A. hoped B. demanded C. allowed D. reminded
24. The reading club in our school welcomes those _____ of detective stories.
A. interested B. enthusiastic C. fond D. addicted
23. However I tried to read it, this sentence just doesn't make _____. Could you explain it to me?
A, sense B. meaning C. thought D. idea
22. I prefer a flat in the downtown area to _____ in the suburb, for I want to live near my school. A. one B. that C. it D. this
第一节:语法和词汇知识(共 15 小题;每小题 1 分,满分 15 分)
从 A、B、C、D 四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
21. ____ Olympic Marathon is 26 miles and 385 yards, ____ distance from Marathon to Athens.
A. The; the B./; a C. An; a D. /;the
4.(本题满分10分)
有一种舞台灯,外形是正六棱柱,在其每一个侧面(编号为①②③④⑤⑥)上安装5只颜色各异的灯,假若每只灯正常发光的概率为, 若一个侧面上至少有3只灯发光,则不需要更换这个面,否则需要更换这个面,假定更换一个面需要100元,用ξ表示更换费用.
(1)求①号面需要更换的概率;
(2)求6个面中恰好有2个面需要更换的概率;
(3)写出ξ的分布列,并求ξ的数学期望.
3.(本题满分10分)
已知矩阵,其中,若点在矩阵的变换下得到点,
(1)求实数a的值;
(2)求矩阵的特征值及其对应的特征向量.