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48. Help yourself to some dumplings        C. Sorry, I thought you can follow me.

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47. I don’t feel well today.             B. Thanks, but I am full..

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46. Can you speak more slowly, please?         A. Go along this street to the end

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2010.四川省自贡市 第一节:补全对话 ,满分10分)

从方框中选择合适的选项补全对话,使对话意思完整、符合逻辑(有两处是多余的)将答案答在答题处。

A:Excuse me .I’ I ask you some questions?

B:Yes,of course.

A:_______76_________

B:Yes,She said that they were hard-working and she loved them very much.

A:What did Yang Lei eat every day at school in Gansu Province?

B:She ate porridge three times a day.

A:___________77_________.

B:She said the school was 2,000 meters above sea level,and at first the thin air made her feel sick.

A:_______78________

B:She said most of their families were poor and they didn’t have enough money for education.

A:________79_______

B:She said she couldn’t do anything about that,but she could open up their eyes to the outside world and give them a good start in life.

A:__________80__________

B:Yes,she liked it very much.She said that when her year was over,she would return to the area after finishing her studies.

A:Thank you very much.  

B:You’re welcome

[答案]76-80 BGECF

(2010•陕西省,七,5)

A)根据对话内容,将方框内符合对话情境的语句抄写在对话空白处,使对话恢复完整。选有两项是多余的。

A:Hi,Wang Lin.Did you see the 8 o’clock prpgram of CCTV 1 last night?

B:No.1______________

A:About environment protection.It tells us some good ways.

B:2__________________

A:Well,we can start  by saving water in our daily life.

B:Yes.3________________________

A:And we’d better not use plastic bags,either.

B:Good idea.4._____________  

A:We can also save paper. 5._______________

B:Right !Everyone can do something to protect our environment.

[答案]CGBFE

(2010•广西省梧州市,III,5)

补全对话 根据对话内容,从方框中选择适当的句子填入空白处,使对话意思完整。(有两个多余选项)

M:The summer vacation is coming.What are you going to do,Mary?

W:I’m going to have a trip.

M:_56_

W:Hainan province.  

M:_57_

W:My parents and my brother.

M:_58_

W:First we’ll fly to Haikou then take a bus to Sanya.

M:_59_

W:About two weeks.

M:_60_

W:Nearly ten thousand yuan.

M:That’s lots of money.Have a good trip!

W:Thank you very much!

[答案]CDAEF

(2010•福建省福州市,II,5)根据对话内容,选择恰当的句子补全下列对话。

A:Jack,I hear that you’ve just come back from Beijing ._96_

B:Oh,it’s fantastic.It’s one of the most interesting places I have ever seen.

A:_97_ 

B:I want to many places,but I’m interested in the Great Wall most .

A:Could you tell me something about it?

B:Well ,it is one of the greatest wonders of  the world.

A:_98_Tell me some more about it.  

B:_99_It’s about 4000 miles long and it looks very wonderful.

A:_100_

B:It’s about 2600 years old .

[答案]FAEGB

(2010•贵州省铜仁市,III、,5)(1)从B栏中找出与A栏相对应的答语,并在答题卡的相应位置将其涂黑。(5分)    A                      B

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2010.四川省内江市  口语应用 满分5分)

从对话后的选项中选择适当的选项补全对话,并将其正确答案写在题后相应的横线上。

(X:Xiao Lin   L:Lin Xin    S:Salewoman)

X:Hello!Li Xin!Where are you going?

L:_71_

X:To Junlin Mall?_72_

L:Dom’t you know what the date is tomorrow?

X:Oh,I remember !Tomorrow is Women’s Day!

L:Yes,you’re right!I’m going to buy a gift for my mother. _73_

X:Of course,I’d like to .Let’s go to the mall together.

(At the shop)

X:_74_

L:I think scarfs are the best ones.

X:That’s great!I agree.

L:How about these ones?

X:They’re beautiful.  

X and L: _75_

S:¥80 for each.They’re ¥160 in all.

X and L:Here you are.

[答案] 71-75 CFBEA

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函数是一种特殊的对应f:A→B,其中集合A,B必须是非空的数集;表示y是x的函数;函数的三要素是定义域、值域和对应法则,定义域和对应法则一经确定,值域随之确定;判断两个函数是否是同一函数,必须三要素完全一样,才是同一函数;表示在x=a时的函数值,是常量;而是x的函数,通常是变量

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例1 求下列函数的定义域:

;② ;③ .

分析:函数的定义域通常由问题的实际背景确定如果只给出解析式,而没有指明它的定义域,那么函数的定义域就是指能使这个式子有意义的实数的集合

解:①∵x-2=0,即x=2时,分式无意义,

时,分式有意义,∴这个函数的定义域是.

②∵3x+2<0,即x<-时,根式无意义,

,即时,根式才有意义,

∴这个函数的定义域是{|}.

③∵当,即时,根式和分式 同时有意义,

∴这个函数的定义域是{|}

另解:要使函数有意义,必须:   Þ

   ∴这个函数的定义域是: {|}

强调:解题时要注意书写过程,注意紧扣函数定义域的含义.由本例可知,求函数的定义域就是根据使函数式有意义的条件,布列自变量应满足的不等式或不等式组,解不等式或不等式组就得到所求的函数的定义域.

例2 已知函数=3-5x+2,求f(3), f(-), f(a+1).

解:f(3)=3×-5×3+2=14;

f(-)=3×(-)-5×(-)+2=8+5

f(a+1)=3(a+1) -5(a+1)+2=3a+a.

例3下列函数中哪个与函数是同一个函数?

;⑵;⑶

解:⑴(),,定义域不同且值域不同,不是;

(),,定义域值域都相同,是同一个函数;

=||=,;值域不同,不是同一个函数

例4 下列各组中的两个函数是否为相同的函数?

      (定义域不同)

    (定义域不同)

    (定义域、值域都不同)

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(四)函数的三要素:  对应法则、定义域A、值域

   只有当这三要素完全相同时,两个函数才能称为同一函数

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(三)函数的值:关于函数值   

例:=+3x+1  则 f(2)=+3×2+1=11

注意:1°在表示对应法则,不同的函数其含义不一样

    2°不一定是解析式,有时可能是“列表”“图象”

    3°是不同的,前者为变数,后者为常数

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(二)已学函数的定义域和值域

1.一次函数:定义域R, 值域R;

2.反比例函:定义域, 值域;

3.二次函数:定义域R

值域:当时,;当时,

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