【題目】 People have always had to find ways to keep food safe to eat. Methods to dry, smoke and salt food were invented thousands of years ago. 【1】 This storage method keeps food safe to eat for long periods of time. Today, canning is one of the most popular methods of storing food.

Clean fruits or vegetables are placed in glass bottles. The food can be put into the bottles either hot or cold. The cold method is used for soft fruits and vegetables that could lose their shape or taste. 【2】 They take up less space in the bottles.

After the food has been placed in glass bottles, boiling water is poured into the bottles to about three centimeters below the top. 【3】 The bottles are placed in a large container filled with warm water that is then brought to a boil.

The water must completely cover the bottles, from three to five centimeters over the top. When the water boils, any air in the bottles will be expelled. The boiling continues for several minutes. Then the bottles are allowed to cool. Finally, they are placed briefly into cold water. 【4】 In other words, a vacuum （真空）is created.

When the bottles are completely cool, notes can be placed on them to identify what is inside. The bottles can then be stored in a cool, dark place at a temperature of between 4℃ and 21℃.

【5】 It is also a good way to store food for six months to a year, or even several years, in case of an emergency. It does not cost much to continue canning every year once the equipment has been purchased.

A.The process of canning is much more recent.

B.This makes a strong barrier to keep the air out.

C.One popular method of canning uses a water bath.

D.Firmer fruits and most vegetables are usually cooked.

E.Canning uses heat to kill bacteria that cause poisons to form in food.

F.Then covers are placed on the bottles, but they are not turned all the way.

G.Canning allows your family to enjoy foods that might not come fresh throughout the year.

【答案】

【1】A

【2】D

【3】F

【4】B

【5】G

【解析】

本文為一篇說(shuō)明文，講述了如何制作罐頭來(lái)延長(zhǎng)食品的保質(zhì)期。

【1】

空格前一句Methods to dry, smoke and salt food were invented thousands of years ago.(干燥、煙熏和加鹽的方法是幾千年前發(fā)明的保存食物的方法)講到了傳統(tǒng)保存食物的方法�？崭窈�Today, canning is one of the most popular methods of storing food.(今天，罐頭是最流行的儲(chǔ)存食物的方法之一)講到了現(xiàn)代的事物保存方法。由此我們可以推斷出，橫線處應(yīng)該是講從傳統(tǒng)的方法到現(xiàn)在的保存法。那么A項(xiàng)The process of canning is much more recent. (裝罐的過(guò)程是最近才開(kāi)始的)很好地起到了過(guò)渡的作用。故此題選A

【2】

本段講到了食物儲(chǔ)存會(huì)放入兩種罐子中�？崭袂耙惶幹v到The cold method is used for soft fruits and vegetables that could lose their shape or taste. (冷法是用來(lái)處理軟的水果和蔬菜，它們可能會(huì)失去形狀或味道)那么空格后應(yīng)該將用熱法來(lái)儲(chǔ)存質(zhì)地較硬的事物。那么D項(xiàng)Firmer fruits and most vegetables are usually cooked.(較硬的水果和大多數(shù)蔬菜通常是煮熟的)滿足這一意義。故此題選D。

【3】

前文說(shuō)到After the food has been placed in glass bottles, boiling water is poured into the bottles to about three centimeters below the top.(把食物放進(jìn)玻璃瓶后，把開(kāi)水倒進(jìn)瓶子里，大約在瓶口以下三厘米處)可知這一句話是在講如何制作罐頭。空格后講到這些瓶子被放在一個(gè)裝滿溫水的大容器里。所以我們推斷出橫線處還是在講裝食物的瓶子的具體情況。所以F項(xiàng)Then covers are placed on the bottles, but they are not turned all the way. (然后在瓶子上蓋上蓋子，但它們不會(huì)一直轉(zhuǎn)動(dòng))具體講瓶子里裝好水后的下一步，就是蓋上蓋子，滿足此處過(guò)渡。故此題選F。

【4】

通過(guò)下一句In other words, a vacuum is created.(換句話說(shuō)真空就形成了)我們可以得知，上一句是在講如何創(chuàng)造真空。那么B項(xiàng)This makes a strong barrier to keep the air out.(這就形成了一個(gè)強(qiáng)大的屏障來(lái)阻止空氣)滿足制造真空的條件。故此題選B。

【5】

橫線下一句It is also a good way to store food for six months to a year, or even several years, in case of an emergency.(這也是一個(gè)很好的方法，以儲(chǔ)存糧食半年至一年，甚至數(shù)年，以防緊急情況)可知，橫線前一句應(yīng)該是在講罐頭事物的保存時(shí)間，那么G項(xiàng)Canning allows your family to enjoy foods that might not come fresh throughout the year.(罐頭可以讓你的家人享受可能一年都不新鮮的食物)就是在講罐頭食物的保質(zhì)期。故此題選G.

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