48. Help yourself to some dumplings C. Sorry, I thought you can follow me.
47. I don’t feel well today. B. Thanks, but I am full..
46. Can you speak more slowly, please? A. Go along this street to the end
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
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
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
例1 求下列函数的定义域:
① ;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,
而时,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,
而,即时,根式才有意义,
∴这个函数的定义域是{|}.
③∵当,即且时,根式和分式 同时有意义,
∴这个函数的定义域是{|且}
另解:要使函数有意义,必须: Þ
∴这个函数的定义域是: {|且}
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?
⑴;⑵;⑶
解:⑴=(),,定义域不同且值域不同,不是;
⑵=(),,定义域值域都相同,是同一个函数;
⑶=||=,;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?
① (定义域不同)
② (定义域不同)
③ (定义域、值域都不同)
(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
(三)函数的值:关于函数值
例:=+3x+1 则 f(2)=+3×2+1=11
注意:1°在中表示对应法则,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°与是不同的,前者为变数,后者为常数
(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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