18．Colorful fruits and vegetables are helpful to our health．Their（61）natural（nature）colors help protect our bodies from disease．Think about the colors of fruits and vegetables---the red of tomatoes，the orange of carrots，the green of apples and the purple of grapes．
You can enjoy（62）eating（eat） fruits and vegetables of all colors---green，yellow，blue，purple，and white．Each color（63）is（be） important to our health．These colors work together to protect（64）our（we） bodies．Scientists have studied them and discovered（65）thegood of colorful fruits and vegetables．The list below shows some benefits of some colors in fruits and vegetables：
Red gives us a healthy heart．It can（66）possibly（possible） reduce heart disease．Red helps improve our memory．
Yellow is good（67）forour eyes．
White can reduce cholesterol（膽固醇）．
Green is helpful to eyes．It also gives us strong bones and（68）teeth（tooth）．
Blue helps us keep a good memory as we grow old．It also helps fight heart disease．
So，（69）when/while/if you are buying or eating fruits and vegetables，remember（70）to try（try）different colors of them．

分析 本文屬于說(shuō)明文，介紹了各種不同顏色的水果和蔬菜的益處．水果和蔬菜的自然的顏色有助于保護(hù)我們的身體不受疾病的侵襲．這些顏色一起發(fā)揮作用來(lái)保護(hù)我們的身體．紅顏色可以給我們一顆健康的心臟．它可以降低患心臟病的幾率．綠色對(duì)眼睛有益．它也可以給我們以強(qiáng)壯的骨骼和堅(jiān)硬的牙齒．所以在日常飲食中，我們應(yīng)該盡可能多的選擇不同顏色的食物和蔬菜．

解答 61．natural；考查形容詞用法．此處用形容詞形式在名詞colors前作定語(yǔ)．
62．eating；考查固定搭配．enjoy doing sth是固定用法，意為"喜歡做某事"．
63．is；考查主謂一致，句子的主語(yǔ)Each color為單數(shù)形式，故謂語(yǔ)動(dòng)詞也要用單數(shù)形式，這里用is與后面的important構(gòu)成系表結(jié)構(gòu)．
64．our；考查物主代詞．本句中we是主格，在句中做主語(yǔ)，而在名詞前要用形容詞性物主代詞做定語(yǔ)．所以本句中使用our修飾名詞bodies．
65．the；考查定冠詞．本句中形容詞good和定冠詞the連用指一類(lèi)事物，同時(shí)表示特指，而且the good的后面還有介詞短語(yǔ)of colorful fruits and vegetables修飾，所以用the表示特指．
66．possibly；考查副詞．本句中使用副詞possibly做狀語(yǔ)修飾動(dòng)詞reduce．
67．for；考查介詞固定搭配．固定短語(yǔ)be good for意為"對(duì)…有益健康的"．．
68．teeth；考查名詞復(fù)數(shù)形式．因tooth是可數(shù)名詞，且要與and前面的bones并列，故用復(fù)數(shù)形式．．
69．when/while/if；考查句式結(jié)構(gòu)關(guān)系，結(jié)合上下文分析，本句可理解為"如果/當(dāng)你賣(mài)蔬菜水果的時(shí)候…"，所以此處可以用if引導(dǎo)一個(gè)條件狀語(yǔ)從句，或用when/while引導(dǎo)一個(gè)時(shí)間狀語(yǔ)從句．
70．to try；考查固定結(jié)構(gòu)．動(dòng)詞短語(yǔ)remember to do記住要做…，表示去做未做的事情．而remember doing sth．記得做過(guò)某事，使用動(dòng)名詞doing表示已經(jīng)做過(guò)的事情．

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．

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