2． 介词填空
1) Dave didn’t respond ______ any of her emails.
2) He rested his elbows _______ the table and leaned forward.
3) The man retired ______ teaching three years ago.
4) Parents should reward children _______ their good behavior.
5) They aimed to make the country safe _________ terrorist attacks.
6) It is possible to disagree with people and still treat them _______ respect.
7) My suitcase was so full that I didn’t have room ________ anything else.
8) Lost in the desert, Mark went in search ___________ water
9) He reminded me to return the books _______ the library on time.
10) He jumped into the cold river and saved the child _______ drowning.
1． 单词拼写
1) The teacher gave the children some chocolate to r___________ them for behaving well.
2) Let’s go to that r__________ and try some Chinese food.
3) I didn’t bother to cook and just had a ham s___________ for lunch. (三明治)
4) The dustman collect the r_________ on Wednesdays.
5) He did very well at math and won a s___________ to Cambridge University.
6) We all have a r___________ to protect the environment. (责任)
7) They’re working together to solve the r_____________. (谜语)
8) The r___________ was launched from a space research base.
9) This broadcast comes live via s_______________ from New York. (卫星)
10) She works as a s___________ in a big international company. (秘书)
5．句子翻译
1) 价格降低了21%。(reduce)
2) 她拒绝接受他们的邀请。(refuse)
3) 现在用动物做实验被认为是很残忍的。(regard)
4) 在律师来之前他一直保持沉默。(remain)
5) 婴儿完全依赖别人喂食。(rely)
6) 这首歌曲让我想起了童年。(remind)
7) 我还记得爷爷跟我们做游戏的情景。(remember)
8) 如果你知道答案， 就请举手。(raise)
9) 药品应该放在小孩够不到的地方。(reach)
10) 这对夫妻经常为钱而吵架。(quarrel)
高三英语核心词汇复习第20课时
(see --- small)
4．选词填空
put recover regular relief replace quit receive reserve react remove
1) She _____ no support from her parents; she had to rely on herself.
2) He’s in hospital, ______ from a heart attack.
3) Our _______ opening hours are from 10 am to 7 pm. On weekends we close at 5 pm.
4) The old houses will be torn down and ______ with a shopping mall.
5) Emma is not behaving very reasonably nowadays. I think she’s ______ against her teacher’s strictness.
6) I didn’t recognize Tom until he ______ his dark sunglasses.
7) To our ______, the missing boy finally came back home.
8) It’s fairly risky. Or to ________ it another way, don’t try this at home.
9) These seats are _______ for special guests.
10) Doctors have given him six months to live if he doesn’t _______ drinking.
3．单项选择
1) Lisa! I’m sorry --- I _______ recognize you --- you ________ your hair cut!
A. don’t; had B. didn’t; have had C. don’t; have had D. didn’t had
2) The recording was __________. I can know exactly what happened at that time.
A. bad quality B. good quality C. of bad quality D. of good quality
3) Buy vegetables _______ small quantities for your immediate use.
A. in B. with C. at D. on
4) Tanya, be __________! Our baby is sleeping and you may wake him up.
A. silent B. still C. quiet D. noisy
5) It remains ________ whether the operation was successful.
A. to be seen B. to see C. seeing D. to have seen
6) Australia’s unemployment ______ rose to 6.5% in February.
A. percent B. rank C. level D. rate
7) --- Can you see the sign on the door? --- Yes, it ________ “No Entry”.
A. reads B. reflects C. registers D. reports
8) We regret _______ you that your application has not been successful.
A. informing B. to inform C being informed D. to have informed
9) When the head teacher said someone didn’t obey the class discipline, we all knew whom he was ____________.
A. replying to B. reacting to C. referring to D. relating to
10) The terrible situation required that the manager ________ present.
A. be B. was C. would be D. shall be
2．词形转换
1) Alice read the letter with a __________ expression on her face. (puzzle)
2) This part of the community needs to be protected from ______ prejudice. (race)
3) Unexpectedly, he came to see me on a cold _______ day in October. (rain)
4) I ______ that you are very busy, but could I talk to you for a few minutes? (realization)
5) Tape ______ are widely used in English classes in China. (record)
6) Be __________! You can’t expect her to do all the work on her own!(reason)
7) Keep the file for future _________; it can be looked at in the future. (refer)
8) My car’s quite old, but it’s still pretty ______________ (rely).
9) It’s difficult to meet all the ________ of the strange customers. (require)
10) Do something __________ before going to be --- read a book or take a hot bath. (relax)
1．单词拼写
1) --- Three q______ of the money was spent on the program. --- 75%? Oh, my dear!
2) Robin will take a general knowledge q_____________, and he’ll answer many difficult questions.
3) Tracy works hard and makes r__________ progress in her studies.
4) The PRC stands for the People’s R__________ of China.
5) I have quite a good r___________ with my parents; we are very happy together.
6) Frank’s dream of opening a restaurant became a r_________ in 1987. (现实)
7) Each child had to r____________ a poem to the class. (背诵)
8) Thanks to the R_______ and Opening-up Policy, China’s economy has improved a lot. (改革)
9) We take all the old bottles to be r______________ (循环).
10) He donated money to set up schools in r__________ mountain areas. (偏远的)
解法二 设Sx＝Ax2+Bx(x∈N)
①－②，得A(m2－n2)+B(m－n)＝n－m
∵m≠n ∴ A(m+n)+B=－1
故A(m+n)2+B(m+n)＝－(m+n)
即Sm+n＝－(m+n)
说明 a1，d是等差数列的基本元素，通常是先求出基本元素，再
解的“整体化”思想，在解有关数列题目中值得借鉴．解法二中，由于是等差数列，由例22，故可设Sx=Ax2+Bx．(x∈N)
[例14] 在项数为2n的等差数列中，各奇数项之和为75，各偶数项之和为90，末项与首项之差为27，则n之值是多少？
解 ∵S偶项－S奇项=nd
∴nd=90－75=15
又由a2n－a1＝27，即(2n－1)d=27
[例15] 在等差数列{an}中，已知a1＝25，S9＝S17，问数列前多少项和最大，并求出最大值．
解法一 建立Sn关于n的函数，运用函数思想，求最大值．
∵a1=25，S17＝S9 解得d＝－2
∴当n=13时，Sn最大，最大值S13＝169
解法二 因为a1=25＞0，d＝－2＜0，所以数列{an}是递减等
∵a1＝25，S9＝S17
∴an=25+(n－1)(－2)=－2n+27
即前13项和最大，由等差数列的前n项和公式可求得S13=169．
解法三 利用S9=S17寻找相邻项的关系．
由题意S9=S17得a10+a11+a12+…+a17=0
而a10+a17=a11+a16=a12+a15=a13+a14
∴a13+a14＝0，a13=－a14 ∴a13≥0，a14≤0
∴S13=169最大．
解法四 根据等差数列前n项和的函数图像，确定取最大值时的n．
∵{an}是等差数列
∴可设Sn＝An2+Bn
二次函数y=Ax2+Bx的图像过原点，如图3．2－1所示
∵S9＝S17，
∴取n=13时，S13＝169最大
4．关于几何概型：
(1)我们是就平面的情形给出几何概型的，同样的方法显然也适用于直线或空间的情形，只需将“面积”相应地改变为“长度”、“体积”；
(2)几何概型并不限于向平面(或直线、空间)投点的试验，如果一个随机试验有无限多个等可能的基本结果，每个基本结果可以用平面(或直线、空间)中的一点来表示，而所有基本结果对应于一个区域Ω，这时，与试验有关的问题即可利用几何概型来解决。
3．学好几何概率对于解决后续均匀分布的问题有很大帮助。
