10.The truth(41)thattrees are vital to our life is not a secret.They provide us with food,wood and most (42)importantly(important),oxygen.Now there is one more thing we can add to this list-blocking out harmful bacteria from water.
The discovery(43)was made(make) by a team (44)consisting(consist) of scientists from the Massachusetts Institute of Technology (MIT) and high school students(45)who were seeking a natural water filter-one that would help communities in developing countries that do not have (46)acess(accessible) to modern water filter systems.
The(47)researchers(research),led by Professor Rohit Karnik,decided to turn to trees for help because they could allow liquid to flow through,while blocking out air bubbles.
They began by cutting 1.5-inch-wide sections of tree bark from the branches of a white pine tree.The people related then tested the wood's filtering ability by pouring water containing red dye particles of different sizes through.(48)Totheir amazement,they found that it was effective in trapping all the articles.(49)Encouraged(encourage),the team conducted(50)anotherexperiment,this time with water that contained bacteria.Sure enough,the sapwood held back 99% of the bacteria,allowing only 1% to flow through.

分析 本文主要介紹了一個新發(fā)現(xiàn).樹在我們生活中起著很重要的作用,科學家又發(fā)現(xiàn)了樹的一種新的功能--防止細菌污染水.

解答 41.that 考查同位語從句.同位語從句,說明truth的內(nèi)容,又因為從句中不缺少成分,且意思完整,故選用從屬連詞 that.故填that
42.importantly 考查副詞.句意:他們?yōu)槲覀兲峁┝耸澄锖湍绢^,更重要的是提供了氧氣.此處 most importantly 是在修飾謂語動詞 provide,故用副詞.故填importantly.
43.was made 考查被動語態(tài).此處指上文中的新發(fā)現(xiàn)是由一個被幾個科學家組成的隊伍做出的,the discover 和make 之間是被動.the discovery是單數(shù),而且文章使用一般過去時.故填was made.
44.consisting  考查分詞做定語.句中修飾team,consist of是固定短語,由…組成,不可以用被動態(tài),所以用現(xiàn)在分詞做定語,修飾team..
45.who 考查定語從句. 句中含有定語從句,先行詞是students,從句中缺少主語,所以用who.
46.a(chǎn)cess.考查固定短語. have access to 是固定短語,意思是:可以接近,可以使用.所以用access.
47.researchers 考查主語.分析該句結(jié)構(gòu)可知,謂語動詞為decided,那么能發(fā)出這個動作的主語應(yīng)該為researchers研究人員,研究者.故填researchers.
48.To 考查固定結(jié)構(gòu).to one's amazement是固定結(jié)構(gòu),表示"令某人驚訝的是".故填To.
49.Encouraged 考查分詞做狀語.此處為分詞做狀語,主語team與encourage之間是動賓關(guān)系,故選用過去分詞.故填Encouraged
 50.a(chǎn)nother 考查代詞.根據(jù)上文可知關(guān)于此事做過實驗,這次是除了上次以外的另一個實驗,故用another另一個.故填another.

點評 了解文章大意,分析句子,掌握各種詞法、句法.

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