11．Can people change their skin colour without suffering like pop king Michael Jackson？Perhaps yes．Scientists have found the gene that determines skin colour．
The gene comes in two versions，one of which is found in 99per cent of Europeans．The other is found in 93to 100per cent of Africans，researchers at Pennsylvania State University report in the latest issue of Science．
Scientists have changed the colour of a dark-striped zebrafish to uniform gold by inserting a version of the pigment （色素） gene into a young fish．As with humans，zebrafish skin colour is determined by pigment cells，which contain melanosomes （黑色素）．The number，size and darkness of melanosomes per pigment cell determines skin colour．
It appears that，like the golden zebrafish，light-skinned Europeans also have a mutation（變異） in the gene for melanosome production．This results in less pigmented skin．
However，Keith Cheng，leader of the research team，points out that the mutation is different in human and zebrafish genes．
Humans acquired dark skin in Africa about 1.5million years ago to protect bodies from ultra-violet rays of the sun （太陽光紫外線），which can cause skin cancer．
But when modern humans leave Africa to live in northern latitudes，they need more sunlight on their skin to produce vitamin D．So the related gene changes，according to Cheng．
Asians have the same version of the gene as Africans，so they probably acquired their light skin through the action of some other gene that affects skin colour，said Cheng．
The new discovery could lead to medical treatments for skin cancer．It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson．

71．The passage mainly tells us thatD．
A．people can not change their skin colour without any pain
B．the new discovery could lead to search into ways to change skin colour safely
C．pop king Michael Jackson often changed his skin colour as he liked
D．scientists have found out that people's skin colour is determined by the gene
72．It can be inferred from the passage thatA．
A．nowadays people who want to change their skin colour have to suffer a lot from the damage caused by the chemical treatment
B．Europeans and Africans have the same gene
C．the new discovery could help to find medical treatments for skin cancer
D．there are two kinds of genes
73．Scientists have done an experiment on a dark-striped zebrafish in order toB．
A．find the different genes of humans'
B．prove the humans'skin colour is determined by the pigment gene
C．find out the reason why the Africans'skin colour is dark
D．find out the ways of changing people's skin colour
74．The reason why Europeans are light-skinned is probably thatB．
A．they are born light-skinned people
B．light-skinned Europeans have mutation in the gene for melanosome production
C．they have fewer activities outside
D．they pay much attention to protecting their skin
75．The writer's attitude towards the discovery isC．
A．neutral          B．negative
C．positive         D．indifferent．

分析 這是一篇科普文．科學(xué)家們找到了決定人類膚色的基因．

解答 71-75．DABBC
71題答案：D考查主旨大意，本文講的是科學(xué)家們找到了決定人類膚色的基因；故本題答案為D選項(xiàng)．
72題答案：A考查細(xì)節(jié)推理，根據(jù)最后一段的最后一句It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson．（它也能引導(dǎo)不用像邁克杰克遜所接受的化學(xué)治療而使得皮膚受損的改變皮膚的方法研究）可知本題答案為A選項(xiàng)．
73題答案：B細(xì)節(jié)理解題．依據(jù)文章第三段可知，科學(xué)家把一種色素基因植入斑馬魚的幼魚體內(nèi)，將其變成了金色，從而證明了和人類一樣，斑馬魚的膚色也是由色素細(xì)胞決定的，由此可知B項(xiàng)正確．   
74題答案：B細(xì)節(jié)理解題．依據(jù)文章第四段可知，像金斑馬魚一樣，歐洲人產(chǎn)生黑色素的基因產(chǎn)生了突變，使得黑色素減少，才使他們膚色變淺了．由此可知B項(xiàng)正確．
75題答案：C推理判斷題．依據(jù)文章最后一段的首句The new discovery could lead to medical treatments for skin cancer．這一發(fā)現(xiàn)有助于使用藥物治療來攻克皮膚癌．由此可知作者對(duì)這個(gè)發(fā)現(xiàn)持肯定的態(tài)度，故本題答案為C選項(xiàng)．

點(diǎn)評(píng) 本文是一篇科教類閱讀，題目涉及多道細(xì)節(jié)理解題，做題時(shí)結(jié)合原文和題目有針對(duì) 性找出相關(guān)語句進(jìn)行仔細(xì)分析，結(jié)合選項(xiàng)選出正確答案．推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案．

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科目：高中英語 來源： 題型：閱讀理解

20．Knowing the best way to study will help you to be a better student．By using your time properly，you can do your homework more quickly．Learning to study is not difficult．
The first thing to remember is that you must be willing to learn．It doesn't mean that you must always like the subject．It does mean，however，that you must be wil1ing to do whatever is necessary to learn．Try to understand why it is important and how it will help you now and later to do and learn other things．Knowing mathematics facts will be useful in your whole life．Knowing how to spell makes any kind of writing easier．Sometimes subject that you think is going to be uninteresting will be exciting when you begin to work at it and understand it more clearly．Learning things can be fun if you are willing to work with them．
Here's some advice for you：have a certain time each day and a quiet place with good lighting for study，so that you can concentrate on your study without interruptions（中斷）； have everything ready before you sit down to study，a dictionary，paper，a pen and books； be sure you understand what you should learn before you start； read carefully and pay special attention to the most important things； when memorizing，first find out the main parts and then recite the whole thing； check your homework after you finish it； never forget the importance of review and preview．
62．The main object of the article isD
A．to prove that learning is not difficult   
B．to make the readers be interested in study
C．to tell the importance of self teaching  
D．to tell the students how to study well
63．The first thing to remember in studying is thatC
A．you must like the subject               
B．you must follow the teacher
C．you must enjoy learning 
D．you must study hard
64．We learn things becauseC
A．our parents want us to learn           
B．every student learns at school
C．we may use these things in the future  
D．we like the subjects
65．Which of the following is NOT the advice given in the article？B
A．To put a pen，paper and books beside you before study．
B．To study at any possible time and place．
C．To review and preview．
D．To pay attention to the most important things．

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科目：高中英語 來源： 題型：填空題

1．To apply for（申請(qǐng)）a ideal university，she worked hard to graduate with high marks．

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