4.点到平面的距离、直线和平面的距离以及面面距离的求法:
找出垂线段,在一个平面内求,或用等积法、向量法求,
3.直线和平面垂直的性质定理: 垂直于同一个平面的两条直线平行.
2.直线与平面垂直的判定方法:
(1)判定定理:一条直线和一个平面内的两条相交直线都垂直,则则线垂直;
(2)依定义,一般要用反证法;
(3)和直线的垂面平行的平面垂直于直线;
(4)面面垂直的性质.
1.直线和平面垂直定义:一条直线和一个平面内的任意一条直线都垂直.记作:a⊥α
4.会求斜线与平面所成的角.
3.通过线线垂直、线面垂直、面面垂直的转化提高化归转化能力.
2.掌握三垂线定理及其逆定理
1.掌握直线与平面垂直的定义、判定定理、性质定理,能用文字、符号、图形规范表述.
第三节 书面表达(满分20分)
假如你叫李华,请给笔友Mike写一封100词左右的电子邮件,介绍一下自己的好朋友王飞。内容要点应包括以下几个方面:
1. 17岁男生, 中等身材
2.诚实自信、乐于助人
3.学习刻苦、成绩优秀
4.兴趣广泛、擅长足球
注意:开头和结尾已经给出,可以适当增加细节,以使行文连贯。
Dear Mike,
I’m glad to receive your e-mail. Here I’d like to tell you about my best friend Wang Fei.
Such is my best friend Wang Fei, a lovely boy and an excellent student. I hope you two will become good friends.
Yours,
Li Hua
第二节: 短文改错(共10小题;每小题1分,满分10分)
此题要求改正所给短文中的错误。如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:
此行多一词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并用斜线划掉。
此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。
此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。
注意:原行没有错的不要改。
Although I'm 16 years old, and my father still treats 96. ____________
me as a careless children. He doesn’t value my opinions. 97. ____________
He is very strict with me and often punishes me about 98. ____________
leaving things around in the house while he did this 99. ____________
all time. I think he fails to set me an example to 100. ____________
follow. But he often says, “Doing as I say, not as I do.” 101. ____________
Even worse, he points out my past mistakes to guests, 102. ____________
making me feel hurting. I love my father, but I can’t 103. ____________
bear what he does. I have been tried many times 104. ____________
to talk with he but he never listens. 105. ____________
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