4. 给出下列四个命题:
1若直线⊥平面,∥平面,则⊥;
2各侧面都是正方形的棱柱一定是正棱柱;
3一个二面角的两个半平面所在平面分别垂直于另一个二面角的两个半平面所在平面,则这两个二面角的平面角互为补角;
4过空间任意一点一定可以作一个和两条异面直线都平行的平面。
其中正确的命题的个数有( )
A. 1 B. 2 C. 3 D. 4
3. 为等差数列的前n项和,,等比数列中,,则等于( )
A. B. C. D. 32
2. 若的展开式中各项系数之和为,的展开式各项的二项式系数之和为,则的值是( )
A. B. C. 1 D. -
1. 设集合,那么“”是“”的( )
A. 充分不必要条件 B. 必要不充分条件
C. 充要条件 D. 既不充分也不必要条件
第三节:书面表达(满分15分)
最近,关于“中国高中是否应该取消文理分科”的网上调查吸引了许多网民的积极参与。请你根据下表所给的信写一封英文信,描述被调查者的不同看法和表明你(李华)的看法,并将信发给对此感兴趣的美目笔友Tom。
注意:词数100左右,文章开头已给出,不计入总词数。
网民:netizens;课程:curriculum;文理科:arts and science。
Dear Tom,
Recently many netizens have taken part in the survey about whether the curriculum of senior high school should be divided into arts and science in China.
笫一节:根据句意及首字母或汉语提示,写出各句中所缺单词的正确形式。(每空一词,共10分)
76.Tom hurt Mary so deeply that she would never f him.
77.She has been taking exercise to lose w and stay slim.
78.Everyone knows smoking is h to their health and they try to give it up.
79.A v earthquake hit Yushu and caused more than 1,000 deaths.
80.Whoever isn’t c with what he has always feels disappointed.
81.Mary spent her (童年)in the countryside.
82.If the goes on working hard, he is (可能) to succeed.
83.It is large organization with offices (遍及)the world.
84.Sicuak (风俗)differ greatly from country to country.
85.Most information comes from the direct (观察)of the stars in outer space.
第二节:根据句中所给汉语,完成下列句子。(每空一词,每空0.5分,共10分)
86.既然你不再需要那顶旧帽子,我将把它扔了。
you don’t need that old cap any longer,I'll it .
87.作为我的好朋友,你血该支持我,并尊重我的选择。
As my friend,you should be in me and show my decision.
88.为了确定他在家,我事先给他打了个电话。
To make sure he was at home.I him .
89.如果你不为自己的错误向他们道歉的话,他们是不会放过你的。
If you don‘t to them for your mistake, they won’t-let you
lt.
90.他父亲的去世使得他的家庭更贫困了。那就是他退学的原因。
His father died,leaving the family even . That his dropping out of school.
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