题目内容
11.Centuries ago,man discovered that removing moisture(潮湿)from food helps to store it,and that the easiest way to do this is to expose the food to sun and wind.In this way the North American Indians produce pemmican(dried meat ground into powder and made into cakes),the Scandinavians make stockfish and the Arabs dried dates.All foods include water-cabbage and other leaf vegetables contains as much as 93% water,potatoes and other root vegetables 80%,lean meat 75% and fish,anything from 80% to 60%,depending on how fatty it is.If this water is removed,the activity of the bacteria(细菌)which cause food to go bad is checked.
Fruit is sun-dried in Asia Minor,Greece,Spain and other Mediterranean countries,and also in California,South Africa and Australia.Various methods are used,but in general,the fruit is spread out on trays in drying yards in the hot sun.
Nowadays most foods are dried mechanically.The method of such dehydration(脱水)is to put food in chambers through which hot air is blown at temperatures of about 110℃at entry to about 43℃at exit.This is the usual method for drying such things as vegetables,minced(切碎的)meat,and fish.
Dried foods take up less room and weigh less than the same food packed in cans or frozen,and they do not need to be stored in special conditions.For these reasons they are invaluable to the climbers,explorers and soldiers in battle,who have little storage space.They are also popular with housewives because it takes so little time to cook them.Usually it is just a case of replacing the dried-out moisture with boiling water.
32.According to the text,the open-air method of drying food.C
A.is the one most commonly used today
B.was invented by the American Indians
C.has been known for hundreds of years
D.tends to be unhealthy
33.Bacteria which cause food to go bad.D
A.cannot live in sunlight
B.are killed by drying
C.are in no way dependent on the water contained
D.have their activity greatly reduced by drying
34.Today vegetables are most commonly dried.B
A.on hot and sunny days
B.in hot-air chambers
C.in the sun and wind
D.using the open tray method
35.Housewives like dried foods because they.A
A.are quick to prepare
B.taste better than fresh foods
C.can be packed in a case
D.look fresh when cooked.
分析 本文是一篇说明文,讲述的是一种有效的保存食物的方法-脱水.最初食物脱水是将食物放在太阳底下,暴露在风中,后来食物脱水方法逐渐发生改变,现在最常用的方法比较机械化,是将切碎的食物放入一个小房间里,通过高温的热气将食物脱水,脱水后的食物所占的空间比较小和轻,便于携带,故对于攀登者,研究者,士兵等比较适合,因其比较容易做熟,在家庭主妇中也收到青睐.
解答 CDBA
32 C 细节理解题.由开头Centuries ago,man discovered that removing moisture(潮湿)from food helps to store it,and that the easiest way to do this is to expose the food to sun and wind.可知,最初吧食物放在室外阳光下脱水的方法几百年前就已经开始使用,故C项符合.
33 D 细节理解题.由文中第二段If this water is removed,the activity of the bacteria(细菌)which cause food to go bad is checked.如果脱去水,细菌让食物会变坏的活动会受到抑制,D项,细菌在脱水过程中,这种活动会降低.故D项符合.
34 B 细节理解题.由文中The method of such dehydration(脱水)is to put food in chamber,且下文This is the usual method for drying 可知,把食物放入chamber中是现在食物脱水最常用的办法,故选B.
35 A 细节理解题.根据文中最后一段They are also popular with housewives because it takes so little time to cook them.脱水食物做熟所花的时间特别短,所以在家庭主妇中比较受欢迎,故选择A.
点评 做阅读理解时要快速的浏览全文,把握文章主旨大意,带着问题回到原文,寻找细节或概括相应的答案,最后要理清作者写作思路.
A. | was travelling | B. | travelled | ||
C. | had been travelling | D. | was to travel |