Question

1．The truth（61）thattrees are vital to our life is not a secret．They provide us with food，wood and most（62）importantly（importance），oxygen．Now there is one more thing we can add to this list-blocking out harmful bacteria from water．
The discovery（63）was made（make） by a team consisting of scientists from the Massachusetts Institute of Technology （MIT） and high school students who were seeking a（64）natural（nature） water filter（過(guò)濾器）-one that would help communities in developing countries that do not have access to modern water filter systems．
The（65）researchers（research），led by Professor Rohit Karnik，decided to turn to trees for help because they could allow liquid to flow through，while（66）blocking （block） 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．（67）Totheir amazement，they found that it was effective in trapping all the articles．（68）Encouraged（encourage），the team conducted（69）anotherexperiment，this time with water（70）thatcontained bacteria．Sure enough，the sapwood held back 99% of the bacteria，allowing only 1% to flow through．

Answer 1

分析 本文講述了樹(shù)木在人類(lèi)生活中的重要作用，它不僅能為人類(lèi)提供食物，木材，甚至氧氣，還能幫助凈化人類(lèi)的用水，這點(diǎn)已經(jīng)被一所大學(xué)的研究者通過(guò)實(shí)驗(yàn)得到
了證實(shí)．

解答 61．that；考查關(guān)系代詞，這是一個(gè)同位語(yǔ)從句，所以用that引導(dǎo)．
62．importantly；考查副詞，這里用副詞作狀語(yǔ)，修飾謂語(yǔ)動(dòng)詞provide．
63．was made；考查被動(dòng)語(yǔ)態(tài)，主語(yǔ)discovery與動(dòng)詞make是被動(dòng)關(guān)系，所以要用被動(dòng)語(yǔ)態(tài)，結(jié)合下文時(shí)態(tài)，用was made．
64．natural；考查形容詞，這里用形容詞形式natural修飾后面的名詞water filter．
65．researchers；考查名詞，結(jié)合下文語(yǔ)境，句子要用名詞researchers（研究者）作句子的主語(yǔ)，因?yàn)椴恢挂粋€(gè)研究者，所以用復(fù)數(shù)．
66．blocking；考查動(dòng)詞，while+doing 是一個(gè)省略了""主語(yǔ)+be"的固定結(jié)構(gòu)，表示某一動(dòng)作進(jìn)行時(shí)另一動(dòng)作正在發(fā)生，所以這里空格處應(yīng)填blocking．
67．To；考查介詞，"to one's+名詞"是一個(gè)固定結(jié)構(gòu)，"使人…的是"．
68．Encouraged；考查分詞作狀語(yǔ)，現(xiàn)在分詞作狀語(yǔ)表主動(dòng)，過(guò)去分詞作狀語(yǔ)表被動(dòng)；這里句子的主語(yǔ)the team 與動(dòng)詞encourage是被動(dòng)關(guān)系，所以用過(guò)去分詞作狀語(yǔ)．
69．a(chǎn)nother；考查形容詞，根據(jù)上下文語(yǔ)境，研究者已經(jīng)做了一個(gè)實(shí)驗(yàn)，這里表示"又"做了一次實(shí)驗(yàn)，所以用another．
70．that；考查關(guān)系代詞，這里是關(guān)系代詞引導(dǎo)定語(yǔ)從句修飾前面的water．

點(diǎn)評(píng) 首先要通讀全文，了解大意，抓住上下文語(yǔ)境所提供的信息，仔細(xì)分析帶空格的句子，明確空格所要填的詞義，詞型和短語(yǔ)搭配給出所要填的正確形式，然后整
體閱讀短文，核對(duì)答案．