Don't feel guilty about it．Anyone make mistakes in their life．( )A．canB．mustC．shallD．need 题目和参考答案——青夏教育精英家教网——

题目内容

17．Don't feel guilty about it．Anyone _________make mistakes in their life．（　　）

A．

can

B．

must

C．

shall

D．

need

分析不要为此感到愧疚，任何人一生中都可能会犯错误．

解答答案：A
解析：A：可能；B：必须；C：将要（第一人称）；警告；命令；允诺（第二三人称）；D：需要．根据前面的"不要为此感到愧疚"可知任何人一生中都"有可能"犯错误，故本题答案为A选项；其余选项均不符合题意．

点评本题考查情态动词，做此类题目时一定要先分析各个选项的含义及其用法再结合句意选出正确答案．

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7．Have you ever wondered why there are so many skin colours in the world？Do you know why people living in particular areas usually have a certain colour？Biology and history are the two reasons for this．
Skin contains something called melanin，which determines a person's skin colour．The more melanin a person has，the darker his or her skin will be．The amount of and production of melanin are controlled by genes，but can be affected by other things，such as sunlight．If a person lives in a place with strong sunlight，his or her skin will protect itself by producing more melanin，making the skin darker．In a place with less sunlight，a person's body will produce less melanin，making the skin lighter．
Skin colour is also affected by another source-vitamin D．Humans all need vitamin D to build bones．People can get it by eating foods such as fish and milk，or from sunlight，which causes vitamin production in the skin．Melanin protects skin by absorbing sunlight，so sunlight absorbed by melanin cannot be used for vitamin D production．Therefore，a dark-skinned person will produce less vitamin D than a light-skinned person when they receive the same amount of sunlight．
The connection between vitamin D production and skin colour is clear when we look at evolution．The earliest humans lived in Africa，their dark skin covered with hair．When they moved to places that had less sunlight，their bodies produced less vitamin D because of their dark skin．As a result，their skin made less melanin，so they could get enough sunlight to produce vitamin D．Their skin gradually got lighter and they lost hair．Now，people who live in areas with strong sunlight，like Africa，have darker skin，while people living in other areas have lighter skin．The exception to this is the Inuit，who live in a place with little sunlight，but have dark skin because they eat a lot of fish and have enough vitamin D．
Evolution has given us a rainbow of skin colours．Humans have always had melanin to determine our skin colour．What has changed through history is the environment where we have lived．This has in turn changed our melanin production，and eventually，skin colour．
A World of Skin Colour

Brief introduction	People living in a particular area usually have the （71）sameskin colour and there are many different skin colours in the world．
Reasons for skin colour	The reasons for different skin colours mainly （72）lie/consist in biology and history．
Biological reasons	The amount of melanin，by which a person's skin colour is （73）determined，varies from people to people．The more melanin a person has，the （74）darkerhis or her skin will be． Vitamin D is another source （75）affectingskin colour．Vitamin D is necessary for humans to build bones．Sunlight contributes to vitamin D production in the skin．
（76）Historical reasons	The earliest people in Africa had dark skin with hair covering it because the sunlight is very strong．． When they moved to places where they could not get enough sunlight to （77）producevitamin D，their skin colour became lighter． Generally speaking，people in areas with strong sunlight，have darker skin （78）whilepeople in other areas have lighter skin．
（79）Conclusion/Summary	Melanin （80）playsan important role in our skin colour．With our living environment changing，melanin production is changed，which leads to the changes in our skin colour．

8．Can you play a musical instrument？Where did you learn to play it？If you were a pupil in a British school，you would most probably learn at school．Around 25% of British pupils learn an instrument．What's more，of the 75% that don't，40% would like to．But what instruments do the pupils learn to play？Traditionally，school children learnt classical instruments，such as the piano or violin．This is still true today．Younger children often learn the recorder．As they get older，they start to play the violin or piano．In fact，nearly one out of five music students is learning the violin．The piano，or keyboard，is more popular with older children at secondary school．However，things are changing．More pupils than ever before are now learning the guitar．As many as 16% of pupils learning an instrument are strumming（弹奏）its strings．
British schools do not just offer lessons for instruments．All pupils learn music together as a class．These classes have been changing，too．In the past，the focus of classes was very much Western classical music．But the classes now cover a far wider range of styles，including folk music and world music．In a recent study by Keele University，64% of boys and 70% of girls said they enjoyed music lessons as a class．They like singing and playing instruments and find the lessons fun．
Many schools have orchestras（管弦乐队）and put on concerts each term．It is also common for pupils themselves to form their own bands，copying their rock and pop heroes．In conclusion，music plays a big part in British schools．Pupils can study an instrument，play music together as a class and even take part in concerts and plays．

Title （71）Music in British school
Ⅰ．Statistics for learning instruments
●Around 25% of British pupils （72）learn an instrument．
●40% of the 75% that （73）don't would like to．
●（74）20% learn the violin．
●64% learn the piano or keyboard．
●16% learn strumming instruments．
Ⅱ．Music lessons
●Form→（75）All pupils learn music together as a class．
●Attitude→the majority of the students said they （76）enjoyed/liked/loved/were interested in/were fond of music lessons as a class．
●（77）Styles/Contents/→western classical music/folk music/world music
Ⅲ．Music （78）activities/performances
●orchestras→（79）putting on concerts each term
●bands→being commonly （80）formedby pupils themselves．

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