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?????????8??24?? 1A.C.2
A.???????????
19C.??
6 h
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B.???15 s??
100 m
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B.
D.
D.???????625????????13 h 35 min???????
3????????3????????????????????????????? ????? ?
A.??????? B
C???????? D??????????
4???????????2????????????????F?????????????2m?s2????????F????????????2s?????????( ) A?2m?s B?4m?s C?6m?s D?8m?s
5??????A?B????????10 N???????????????0.3???? F?1 N???????????A?B??A?B????????B?B?A???????? ? A?0?1 NB?0?2 N C?6 N?1 N
D?1 N?1 N
6?2?????A?????B??B?????????A?B?????mA=6kg?mB=2kg?A?B?????????=0.2????F=10N????????????45N?????? [ ] A.???F?12N????????????
B.?????????????????12N????????
C.??????????????? D.????????????
7?????A?B??????m1?m2??????????????????????
A???????F????A???
B??????? ?
A.
m1m2
F B.FC.F
m1?m2m1?m2
D.
m1
F m2
8??????????????????????????s=24t-1.5t2(m)???????????t??? ? ? A?1.5s B?8sC?16s D?24s ?????????6??24??
9??????????????????? ? A???????????????B???????????? C?????????????????????D??????????????? 10?????m?????????F????????????????????t????v??????????2v?????????( )
A????????????1/2????????B???????2F???????? C??????2t????????D??????????????????????? 11????G??????????????????FN?????????? ????????F1??( )
A?F1?FN?G???B?F1?G????????
C?G???F1?????????F2
D?????G?FN?F1???????????????F2 12????????????????????? ?
A????????????????????????
B???????????????????????????????
C????????????????????
D??????????????????????????????????? 13?????????????v-t????????????????????????? ?
A??????????????????????????? B???????????
C???????????????????
D?????????????????????????? ???????
14?????????v-t????????? ? A???4s??????????? B??1~3 s???????????
C?3 s?????????5m/s???????????? D?2 ~3 s??3~4 s?????????? ?????
15??????????????????????????????????????????????????????cm??O?????????????A?B?C?D?????O?????????????????T=0.02 s?????
?1??????????????????????? ???????????? ? ?
?2?????????G???????????vG=_______________???????????G???????vG=____________m/s??????????????g=___________ ??????
16???????????30m/s????????????????5m/s???????????????
?1??????????8S????????????6?? ?2??????????????????????6??
17????500m?????????????g= 10m/s2??? ?1????????????
?2?????????????1s???????1s????? ?3??????????.
2
18????????60kg???????????????????????????????????????10kg???. ????a=2m/s???????????????? ?g?10m/s2?
19.??????????????37 ????????16m???????20m/s?????? 10m/s?????????.???????????????????0.5kg????????????????????0.5.?????????????????.sin37?0.6?
2
???????????
1.y=log0.5(4-x2) 0.5??? ?????
????,???????????,????????????. ??y=log0.5(4-x2) ???????-2,2?,??????????,???????,????0.5?1,??????????,?h=4?x^2,?h????????,?h????????,h=4?x^2????????,0?,?????0,+??,???????-2,2?,??????????????2,0?,???????0,2?.
2.??y=lg(mx^2-2x+1)?????R????m????? lg(mx^2-2x+1)?????R
?mx^2-2x+1>0?x?R????
(1)
?a=0 -2x+1>0???? (2)
?m>0 mx^2-2x+1>0?x?R????
???<0 4-4m<0
m>1
(3)
?m<0
???????????
???mx^2-2x+1>0?x?R????
????m>1
3.?0?x?1?a?0?a?1???|loga?1-x?|?|loga?1+x?|???
????a?1??
|loga?1-x?|=-loga?1-x??|loga?1+x?|=loga?1+x??
|loga?1-x?|-|loga?1+x?|=-[loga?1-x?+loga?1+x?]=-loga?1-x2?? ?a?1?0?1-x2?1??-loga?1-x2??0?
?|loga?1-x?|?|loga?1+x?|?
?0?a?1??
|loga?1-x?|=loga?1-x??|loga?1+x?|=-loga?1+x??
|loga?1-x?|-|loga?1+x?|=loga?1-x2??
?0?a?1?0?1-x2?1??loga?1-x2??0?
?|loga?1-x?|?|loga?1+x?|?
???0?x?1?a?0?a?1????|loga?1-x?|?|loga?1+x?|?
4.??????y=ax^2+bx+c(a>0)?[-b/2a,+?)?????.
??
=a(x1^2-x2^2)+b(x1-x2) =a((t1-b/2a)^2-(t2-b/2a^2))+b(t1-t2) =a(t1-t2)(t1+t2-b/a)+b(t1-t2) =(t1-t2)(at1+at2) >0,
??y=ax^2+bx+c(a>0)?[-b/2a,+?)?????.
5.??????R?????f(x),?x>0?,f(x)=x^2+x-1,???x=0
?,f(x)=______;?x?0?,f(x)=_____
???
?f?x??????R?????,
?f?-x)=-f(x),
?f(0)=0
???x>0?,f(x)=x^2+x+1,
??x?0?,-x?0,?f(-x)=?-x?^2+?-x?+1=x^2-x+1
?-f(x)=x^2-x+1,
?f(x)=-x^2+x-1,
???f(x)={x^2+x+1,x?0
0 ,x=0
-x^2+x-1,x?0
?x1=t1-b/2a,x2=t2-b/2a,t1>t2>0. ,y1-y2
6.????f(x)????,???(-??,0)?????,??f(x)?(0,???)????,??????? ??????f(x)????,???(-??,0)?????
???f(x)????,???(0,+??)?????
??????f(x)????
?f(-x)=f(x)
?0<x1<x2
f(-x1)=f(x1),f(-x2)=f(x2)
?f(x)?(-??,0)?????
-x1>-x2==>f(-x1)<f(-x2)==>f(x1)<f(x2)
???f(x)????,???(0,+??)?????
7.????f(x)=2^x-2^-x/2^x+2^-x???f(x)????????????????
f(x)=[2^x-2^(-x)]/[2^x+2^(-x)]=(2^x-1/2^x)/(2^x+1/2^x)=(4^x-1)/(4^x+1)=1-2/(4^x+1)?
(1)?x1<x2??4^x1<4^x2?
f(x1)-f(x2)=2(4^x1-4^x2)/[(4^x1+1)(4^x2+1)]<0??f(x1)<f(x2)??f(x)????????
(2)??4^x+1>0?R???????f(x)?????R?
4^x+1>1?0<1/(4^x+1)<1?-2<-2/(4^x+1)<0?-1<1-2/(4^x+1)<1???f(x)????(-1,1)?
8.???f?X?=?lgx???0<a<b,?f?a?>f?b?????ab<1 ????????1>b>a>0 ??????f(a)=-lga f(b?=-lgb f(a)+f(b)=-lgab ??f(a)>0 f(b)>0 ??lgab<0 ??ab<1
??????b>1>a>0 ??????f(a)=-lga f(b?=lgb ??f(a)>f(b) ??f(a)-f(b)=-lgab>0 ??lgab<0 ??ab<1
??????b>a>1 ?????????f(a)>f(b)
?? ab<1
9.??f(x)=x+1/x,???????x I x?0?
??,???????.
??????.
?,?x>0?,????????x+1/x?2?x(1/x)=2,????x1/x?,?x=1???,
?,?x<0?,-x>0?,???????-?x+1/x??2?-x(-1/x)=2,????-1,?x+1/x?-2.
????-x=-1/x,?x=-1????.
???????????????????,????.
??????f(x)=x+1/x????.
limx????x+1/x-x?=limx????1/x?=0,??????y=x???f(x)=x+1/x?????.
????
??f(x)=ax+b/x,a,b????????????,?????????f(x)=x+1/x?????f(x)=ax+b/x,a,b????.
?????????????,
limx????ax+b/x-ax?=limx????b/x?=0,????,??f(x)=ax+b/x?????y=ax.
f(x)=x+1/x D=(-???,0)?(0,+???)
???? ?(-???,-1)?(0,1)?????,(-1,0)?(1,+???)????? ???(-???,-2]?[2,+???)
f(x)=ax+b/x=a(x+b/ax) D=(-???,0)?(0,+???) ????
???x=b/ax???,?x=+-sqrt(b/a)
???(-???,-sqrt(b/a))?(0,sqrt(b/a))?????,(-sqrt(b/a),0)?(sqrt(b/a),+
??????????????????(???)
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1. B 2. A 3. C
4. ?????????????????????????????
5. A 6. A 7. B
8. ?????????????????????????
9. (1)?????????????????????(2)?????????????????
10?(1)???(2)?????????????????????????????????????????????????????????(3)???????????????????????????????????????????
11?BE 12. D 13. B 14. C 15. C
16.(1)????????????????????????????????????????(2)??????????????????????????(3)??????????????????????????????????
17. ???????????????????????????????????????????????????????????????????????????????????(??)? 18. ?????????? 19. ????????????? 20. ???????
21. ?????? 22. ?????? 23. ??????
24. ??
????
1. D 2. A 3. D 4. A
5.(1)????????????????????????????(2)?????????????????????????????????????
6???????????????????????????????????????????????????????
7?(1)???????????????????(2)?????????????????????????
8?(1)?????????????????????????????????????????(2)??????????????????????????????????????????????????
9.(1)???????????????????????????(2)???????(???)???????????????????????????
10. ????????????????????????????????????????????????????
11. B 12. ? 13. B 14. A
15. ????????????????????????????????????
16?(1)?????????????????????????(2)?????????????????????????????????
17. ??????? 18. ??????? 19. ??????
20. ????????? 21. ?????? 22. ??????
23. ???????2012?8?26??27???????23???????18????????????????????
24. ?????
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?????????????????????????????????????????????????????????
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1.(1)?????????(2)????????
2.(1)??????????(2)??????????
3.(1)?????????????????????????????????(2)?????????????????????????????????
4. B?D
5.(1)?????????????????????????(2)??????????????????????????
6.(1)????????????????????????????????(2)????????????????????????????
7. ?????????????????????????????????????????????????????????????????????????????????????????????
????????????
8. A?D 9. C 10. D 11. C 12. A
13. ??????????????????????????????(???)??????????????????????????????????
14.(1)????????????????????????????????????????????????????????????(2)???????????????????????????????????????????(3)????????????????????????????(????)????????????????
15. ????????????????????????????????????????????????????????????????
16. ????????????????????????????
17. ??????? ????? 18. ???? ???? 19. ???? ???? 20. ?????? ??????
21. ?????
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????
1. ??????????????????????????????????????????????????????????
2. ???????????????????????
3. ???????????????????
4. A?C
5. ????????????????????????????????????
6. ?????????????????????????????????????????????????????????????
7. ?????????????
8. ????????????????????????????????????
9. C
10. ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
11.(1)D (2)B 12.(1)C (2)B (3)C 13. C 14. C 15.(1)C (2)B
16. ????????????17. ????????
18. A 19. A 20. B 21. C
22. ???????????????????????????
23. ???????????????????????????????????
24. ??????????????? 25. ?????? 26. ??????????????????? 27. ??????????????? 28.?? ?? ??? ??????????????????????
29. ?????
???????
????????????????????????????????????"??"?
????????????????????????????????????????????????????????????????????????
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?????????????????????????????????????:???????????????????????
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???????????????????????????????????????????????????????????????????"??"?????
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??
????
??1?5 CBABD 6?10 CDADA 11?15 BCDBB
??16?20 BDCDA 21?24 CABA 25?29 DDACB 30?33 BCAC 34?38 CABCD
??1. Effects 2. Healing 3. bridges 4. understand 5. Making 6. listening 7. Tips 8. attentively
9. patient 10. actions
??One possible version:
I?m a student of Senior 1. I am writing to ask you for some advice.
Since last week, my parents and teachers have kept asking me to board in the school. They say it will be very convenient for me to ask questions whenever and wherever. Besides, they think boarding will make it possible to make full use of my night time, and that I also develop the ability to look after myself.
However, I have my own thoughts. If staying at home in the evening, I will have more time to work at my lessons. At the same time, I can learn what I think I?m not good at. I really don?t know how to deal with the disagreement between us. Can you give me your advice?
Yours,
Li Ming.
????
??1?5 BBDBB 6?10 DACDB 11?15 CDCDA 16?20 CCBCB
??21?24 BCAD 25?29 CCDAA 30?33 AADB 34?36 CBB 37?40 AECB
??1. Results 2. Failure 3.Tips 4. get. 5. calculating and judging 6. belief 7. stressful 8. yourself
9. Benefits 10. Improving
??One possible version:
Dear smith,
I?m glad to learn that you are a Chinese lover and want to know how to improve your Chinese learning. Here are some tips for you.
You may find Chinese hard to learn at the beginning because it is totally different from English. To improve your Chinese, first of all, you?d better practice speaking as often as possible. For example, you can practice Chinese with your pen pals or net friends. Besides, there is a very good Chinese-teaching program on CCTV 9 called learn to speak Chinese, which is designed for Chinese learners. The website is , where you can learn Chinese pronunciation and know more about Chinese culture. I?m sure it will benefit you if you make it a rule to follow it every day.
I hope my advice will be of help to you.
Yours,
Li Jing.
????
??1?5 CADBD 6?10 ACBDA 11?15 CBDAC 16?20 DBCAB
??21?24 DBAA 25?28 DACB 29?33 AACCD 34?37 CDAB
??1. vocabulary 2. Eich 3. speaking 4. Worries 5. tense 6. attention 7. Lack 8. Having
9. passive(or ?reactive?) 10. advantage
??One possible version:
Travelling
Travelling is a very good activity. When you are free?you can go to a beautiful place to enjoy the beauty of nature. You can breathe the fresh air, meet different people and make friends with them. Thus you will relax.
But travelling is not always pleasant. For example, the weather can be changeable. You may be caught in the rain and may catch a cold while travelling. You may have your money stolen or may be injured.
Therefore, when going on a trip, you must prepare yourself carefully. You should have clear information about the weather, choose a good travelling companion and be very careful about where you go so as to avoid accidents. If so, you will surely enjoy yourself.
????
???????????????
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发表于 2019-9-13 23:46:11