14.Forget chip fat,sugar cane or rapeseed oil-the latest source of biofuel could be watermelons.Scientists have discovered that the fruit is a great source of sugar that can be readily distilled (蒸餾) into alcohol to power cars and farm machinery.
And sellers reject 360,000tons of"substandard"fruit every year in America alone which could be used as an economical way to make fuel.The waste from US growers could produce nearly two million gallons (nine million litres) of biofuel per year.
In the study,researchers at the United States Department of Agriculture set out to determine the biofuel potential of juice from rejected watermelons-those not sold due to   cosmetic  imperfections,and currently ploughed back into the field.About a fifth of each yearly watermelon crop is left in the field because of surface blemishes (瑕疵) or because they are misshapen.
Dr.Wayne Fish,who led the team,found that 50percent of the fruit was fermentable (可發(fā)酵的) into alcohol which could provide valuable fuel.
"We've shown that the juice of these watermelons is a source of readily fermentable sugars,representing an unexploited raw material for alcohol biofuel production,"he said.
The study,published in the journal Biotechnology for Biofuels,discovered that watermelons could produce around 20gallons of fuel per acre from fruit that otherwise would go to waste.
Production of biofuels has been targeted by Western governments as a way to support renewable energy targets.
The European Union has a target for 2010that 5.75percent of transport fuels should come from biological sources,but the target is unlikely to be met.
The British government's Renewable Transport Fuel Obligation requires five percent of the fuel sold at the pump by 2010to be biofuel.

53.The passage mainly tells usD.
A.watermelon juice will be the largest source of renewable energy
B.the advantages of fuel made from watermelons
C.Western countries aim at producing biofuels
D.watermelons could be used to make fuel
54.It can be learned from the text thatC.
A.a(chǎn)bout two gallons of fuel could be made from rejected fruit per acre
B.sellers in the world throw away 360,000tons of watermelons every year
C.half of the watermelons were fermentable into alcohol to provide energy
D.five percent of fuel is required to be biofuel from watermelons by 2010in Britain
55.The underlined word"cosmetic"in Paragraph 3probably meansC.
A.fresh  B.sweet  C.surface  D.inside
56.We can infer from the passage thatB.
A.it will cost a lot to make biofuel from watermelons
B.Western countries are engaged in biofuel study but still have a long way to go
C.watermelon juice has been used as a source of sugars to produce alcohol biofuel
D.the European Union is likely to meet its target of transport fuels from biological sources.

分析 本文介紹了西瓜可以用作生物燃料的研究.科學(xué)家把西瓜里的糖分蒸餾成酒精,從而給汽車(chē)提供燃料.這種技術(shù)利用因?yàn)楸砻娴蔫Υ帽蝗栽诘乩镞@些西瓜,百分之五十的西瓜被發(fā)酵成酒精,這酒精能提供寶貴的燃料.雖然西方國(guó)家進(jìn)行生物燃料的研究,但是他們?nèi)耘f有很長(zhǎng)的路要走.

解答 53.答案:D.主旨大意題.根據(jù)第一段中the latest source of biofuel could be watermelons可以知道最新的生物燃料來(lái)源是西瓜,而后面幾段介紹了這個(gè)研究的過(guò)程,所以選擇D.watermelons could be used to make fuel(西瓜能夠被用來(lái)制作燃料).
54.答案:C.細(xì)節(jié)題.根據(jù)第四段中50percent of the fruit was fermentable (可發(fā)酵的) into alcohol which could provide valuable fuel(百分之五十的西瓜被發(fā)酵成酒精,這酒精能提供寶貴的燃料.).
可以知道答案是C,而第六段中watermelons could produce around 20gallons of fuel per acre from fruit that otherwise would go to waste(每畝被扔掉的西瓜可以產(chǎn)出20加侖的燃料)證明A項(xiàng)是錯(cuò)的;第二段中 sellers reject 360,000tons of"substandard"fruit every year in America alone(單單在美國(guó),銷(xiāo)售者每年都扔掉360000噸的不合格水果) 證明B項(xiàng)是錯(cuò)的;末段中的five percent of the fuel sold at the pump by 2010to be biofuel.(到2010年,加油站賣(mài)的油要有百分之五是生物燃料.)證明D項(xiàng)是錯(cuò)的,外延大了.
55.答案:C.詞義猜測(cè)題.根據(jù)劃線單詞的下一句About a fifth of each yearly watermelon crop is left in the field because of surface blemishes 可以知道這些西瓜被仍在地里是因?yàn)楸砻娴蔫Υ,所以選擇C urface(表面的).
56.答案:B.推理判斷題.根據(jù)倒數(shù)第二段but the target is unlikely to be met.可以知道這個(gè)目標(biāo)很難實(shí)現(xiàn),所以選擇B.Western countries are engaged in biofuel study but still have a long way to go(西方國(guó)家進(jìn)行生物燃料的研究,但是他們?nèi)耘f有很長(zhǎng)的路要走.)

點(diǎn)評(píng) 考查科技類(lèi)閱讀.
要做好閱讀理解,必須找出一定的方法,但每一個(gè)方法不一定適合所有的閱讀理解題,所以必須要多讀,多練,要勤于思考,更要學(xué)會(huì)巧讀,這樣才能達(dá)到事半功倍的效果,要不斷擴(kuò)大詞匯量,拓寬閱讀面,提高閱讀速度,同時(shí)也要探索和總結(jié)適合自己方法或,實(shí)踐出真知,多練出效益,才能在高考中立于不敗之地.

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