4.點(diǎn)到平面的距離、直線和平面的距離以及面面距離的求法:
找出垂線段,在一個(gè)平面內(nèi)求,或用等積法、向量法求,
3.直線和平面垂直的性質(zhì)定理: 垂直于同一個(gè)平面的兩條直線平行.
2.直線與平面垂直的判定方法:
(1)判定定理:一條直線和一個(gè)平面內(nèi)的兩條相交直線都垂直,則則線垂直;
(2)依定義,一般要用反證法;
(3)和直線的垂面平行的平面垂直于直線;
(4)面面垂直的性質(zhì).
1.直線和平面垂直定義:一條直線和一個(gè)平面內(nèi)的任意一條直線都垂直.記作:a⊥α
4.會(huì)求斜線與平面所成的角.
3.通過線線垂直、線面垂直、面面垂直的轉(zhuǎn)化提高化歸轉(zhuǎn)化能力.
2.掌握三垂線定理及其逆定理
1.掌握直線與平面垂直的定義、判定定理、性質(zhì)定理,能用文字、符號(hào)、圖形規(guī)范表述.
第三節(jié) 書面表達(dá)(滿分20分)
假如你叫李華,請(qǐng)給筆友Mike寫一封100詞左右的電子郵件,介紹一下自己的好朋友王飛。內(nèi)容要點(diǎn)應(yīng)包括以下幾個(gè)方面:
1. 17歲男生, 中等身材
2.誠實(shí)自信、樂于助人
3.學(xué)習(xí)刻苦、成績優(yōu)秀
4.興趣廣泛、擅長足球
注意:開頭和結(jié)尾已經(jīng)給出,可以適當(dāng)增加細(xì)節(jié),以使行文連貫。
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
第二節(jié): 短文改錯(cuò)(共10小題;每小題1分,滿分10分)
此題要求改正所給短文中的錯(cuò)誤。如無錯(cuò)誤,在該行右邊橫線上畫一個(gè)勾(√);如有錯(cuò)誤(每行只有一個(gè)錯(cuò)誤),則按下列情況改正:
此行多一詞:把多余的詞用斜線(\)劃掉,在該行右邊橫線上寫出該詞,并用斜線劃掉。
此行缺一個(gè)詞:在缺詞處加一個(gè)漏字符號(hào)(∧),在該行右邊橫線上寫出該加的詞。
此行錯(cuò)一個(gè)詞:在錯(cuò)的詞下劃一橫線,在該行右邊橫線上寫出改正后的詞。
注意:原行沒有錯(cuò)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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