题目内容
20．It took him much longer-hundreds ofextra（额外的）hours to improve his skills．分析 提高技能花费了他更长的时间-额外的数百个小时．
解答 答案：extra
根据应填词语修饰"hours"可知，应填词语为形容词．"额外的"应译为"extra"，故答案为extra．
点评 做这道题时应根据句子判断出应填词语的词性，然后写出其适当形式．
练习册系列答案
相关题目
1．Fashion is（36）B of culture．the Tang costume stands（37）AChinese history and fashion culture．It（38）ATang costume when China became known to other countries（39）Cthe Han and Tang dynasties．From then on，people called Chinese clothes Tang costumes．
Chinese fashion is not only different from western fashion，（40）Bfrom that in other Asian countries such as Japan and Korea．The beautiful silk knots and the other decorations on Tang style clothes are popular all over the（41）Anow
Today people can design the Tang costume as（42）Aformal or casual clothes．it （43）Cboth the wearer's personal style and （44）Crich traditional culture．So we say the Tang costume is very（45）Band very different from western-style suits．
Chinese fashion is not only different from western fashion，（40）Bfrom that in other Asian countries such as Japan and Korea．The beautiful silk knots and the other decorations on Tang style clothes are popular all over the（41）Anow
Today people can design the Tang costume as（42）Aformal or casual clothes．it （43）Cboth the wearer's personal style and （44）Crich traditional culture．So we say the Tang costume is very（45）Band very different from western-style suits．
| 36．A．filled | B．full | C．made |
| 37．A..for | B．to | C．in |
| 38．A．was called | B．is called | C．call |
| 39．A．before | B．among | C．during |
| 40．A．and also | B．but also | C．and |
| 41．A．world | B．country | C．nation |
| 42．A．either | B．neither | C．both |
| 43．A．express | B．expressed | C．expresses |
| 44．A．Japan's | B．Korea's | C．China's |
| 45．A．interesting | B．attractive | C．new． |
8．
"Low carbon"becomes the most popular words these days because more and more people pay attention to our environment．Not only China but all other（11）A concentrate on the topic of"low carbon"．Low carbon life（12）B a kind of lifestyle in which people do their best to use less energy．The purpose of the lifestyle is to push us to（13）Cthe environment．
Because of the fast increase of population and human*desire，the human living environment，health and safety are（14）D worse and worse．So we can say，the lifestyle is becoming the killer of the earth and human beings．Therefore，low carbon life is needed by man's own health．So we should develop good（15）D in our daily life．For example，when we go shopping，we'd better use（16）Cplastic bags．We should eat more（17）Band less meat．As for clothing，we'd better buy the necessary clothes and not buy clothes with animal*leather．As for housing，when building a（18）A，we must use green material； buy the lights that need less energy and remember to（19）A the lights when not needed； put rubbish into different kinds and recycle the useful things，like bottles and paper．As for transportation，we can（20）A if you go to the places near your house．For short trips，we can ride a bike instead of driving a car．Try to use public transportations．As for working，companies should（21）Dclerks to use e-mail，MSN and other ways instead of using paper．We use paper only when necessary．For using （22）D：If you don't use computer in a short time，you can change the computer into its"sleep"．
Besides，we should try（23）C best to tell the people around us the importance of the low carbon lifestyle．And we can also ask them to（24）Cus to take the low carbon life，in this way，not only can we make our city better，（25）B also it's good for ourselves．
In all，it weighs greatly for all of us to put the low carbon lifestyle into practice．
"Low carbon"becomes the most popular words these days because more and more people pay attention to our environment．Not only China but all other（11）A concentrate on the topic of"low carbon"．Low carbon life（12）B a kind of lifestyle in which people do their best to use less energy．The purpose of the lifestyle is to push us to（13）Cthe environment．Because of the fast increase of population and human*desire，the human living environment，health and safety are（14）D worse and worse．So we can say，the lifestyle is becoming the killer of the earth and human beings．Therefore，low carbon life is needed by man's own health．So we should develop good（15）D in our daily life．For example，when we go shopping，we'd better use（16）Cplastic bags．We should eat more（17）Band less meat．As for clothing，we'd better buy the necessary clothes and not buy clothes with animal*leather．As for housing，when building a（18）A，we must use green material； buy the lights that need less energy and remember to（19）A the lights when not needed； put rubbish into different kinds and recycle the useful things，like bottles and paper．As for transportation，we can（20）A if you go to the places near your house．For short trips，we can ride a bike instead of driving a car．Try to use public transportations．As for working，companies should（21）Dclerks to use e-mail，MSN and other ways instead of using paper．We use paper only when necessary．For using （22）D：If you don't use computer in a short time，you can change the computer into its"sleep"．
Besides，we should try（23）C best to tell the people around us the importance of the low carbon lifestyle．And we can also ask them to（24）Cus to take the low carbon life，in this way，not only can we make our city better，（25）B also it's good for ourselves．
In all，it weighs greatly for all of us to put the low carbon lifestyle into practice．
| 11．A．countries | B．cities | C．towns | D．villages |
| 12．A．helps | B．means | C．lives | D．thinks |
| 13．A．keep | B．pollute | C．protect | D．make |
| 14．A．doing | B．trying | C．discovering | D．becoming |
| 15．A．lists | B．shops | C．decisions | D．habits |
| 16．A．more | B．less | C．fewer | D．many |
| 17．A．tea | B．vegetables | C．meat | D．food |
| 18．A．house | B．bridge | C．store | D．market |
| 19．A．turn off | B．turn on | C．put off | D．put on |
| 20．A．walk | B．rush | C．run | D．drive |
| 21．A．make | B．let | C．see | D．encourage |
| 22．A．machine | B．light | C．bed | D．computer |
| 23．A．ours | B．we | C．our | D．us |
| 24．A．stop | B．tell | C．join | D．hear |
| 25．A．so | B．but | C．and | D．though． |