26.Please do me a favor -______ my friend Mr. Smith to Youth Theater at 7:30 tonight.
A. to invite B. inviting C. invite D. invited
25. ______ herself with other girls, she feels she is quite lucky.
A. Comparing B. Compared C. To compare D.Being compared
24.- Lovely weather, isn’t it?
- Yes, a bit hot, ______.
A. although B. but C. though D. yet
23. Canada has vast areas of wilderness, from the Arctic north, _______ average winter temperatures are usually -20 0C, to the border with the USA in the south, _______ is said to be the longest border in the world not defended.
A. which, where B. whose, which C. where, where D. where, which
22.. Garter Druse ______ his being selected for the important task to his courage,devotion and knowledge of the area.
A. led B. owed C. devoted D. contributed
第一节 单项填空(共15小题;每小题1分,满分15分)
从A、B、C和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. ______ Flying Luxury Hotel of Tomorrow is ______ huge 400-ton aircraft without wings.
A. /, a B. The, a C. The, the D. A, a
24、将一个半径适当的小球放入如图所示的容器最上方的入口处,小球将自由下落.小球在下落的过程中,将3次遇到黑色障碍物,最后落入袋或袋中.已知小球每次遇到黑色障碍物时,向左、右两边下落的概率都是.
(Ⅰ)求小球落入袋中的概率;
(Ⅱ)在容器入口处依次放入4个小球,记为落入袋中的小球个数,试求的概率和的数学期望.
22、若矩阵属于特征值6的特征向量为,并且点在矩阵的变换下得到点,求矩阵。
23如图,在四棱锥中,底面是正方形,侧棱,为中点,作交于
(1)求PF:FB的值
(2)求平面与平面所成的锐二面角的正弦值。
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