首页
登录
职称英语
All living cells on earth require moisture for their metabolism. Cereal grai
All living cells on earth require moisture for their metabolism. Cereal grai
游客
2025-01-16
27
管理
问题
All living cells on earth require moisture for their metabolism. Cereal grains when brought in from the field, although they may appear to be dry, may contain 20 per cent of moisture or more. If they are stored in a bin thus, there is sufficient moisture in them to support several varieties of insects. These insects will, therefore, live and breed and, as they grow and eat the grain, it provides them with biological energy for their life processes. This energy will, just as in man, become manifest as heat. Since the bulk of the grain acts as an insulator, the temperature surrounding the colony of insects will rise so that, not only is part of the grain spoiled by the direct attack of the insects but more may be damaged by the heat. Sometimes, the temperature may even rise to the point where the stored grain catches fire. For safe storage, grain must be dried until its moisture content is 13 per cent or less.
Traditional arts of food preservation took advantage of this principle in a number of ways. The plant seeds, wheat, rye, rice, barley millet, maize, are themselves structures evolved by nature to provide stored food. The starch of their endosperm is used for the nourishment of the embryo during the time it over-winters (if it is a plant of the Temperate Zone) and until its new leaves have grown and their chlorophyll can trap energy from the sunlight to nourish the new-grown plant. The separation by threshing and winnowing is, therefore, to some degree part of a technique of food preservation.
The direct drying of other foods has also been used. Fish has been dried in many parts of the world besides Africa. Slices of dried meat are prepared by numerous races. Biltong, a form of dried meat, was a customary food for travelers. The drying of meat or fish, either in the sun or over a fire, quite apart from the degree to which it exposes the food to infection by bacteria and infestation by insects, tends also to harm its quality. Proteins are complex molecular structures which are readily disrupted. This is the reason why dried meat becomes tough and can, with some scientific justification, by likened to leather.
The technical process of drying foods indirectly by pickling them in the strong salt solutions commonly called "brine" does less harm to the protein than straightforward drying, particularly if this is carried out at high temperatures. It is for this reason that many of the typical drying processes are not taken to completion. That is to say, the outer parts may be dried leaving a moist inner section. Under these circumstances, preservation is only partial. The dried food keeps longer than it would have undried but it cannot be kept indefinitely. For this reason, traditional processes are to be found in many parts of the world in which a combination of partial drying and pickling in brine is used. Quite often the drying involves exposure to smoke. Foods treated in this way are, besides fish of various sorts, bacon, hams and numerous types of sausages. [br] We can learn from the passage that salting preserves food by ______
选项
A、destroying the protein
B、drawing away moisture from the food
C、drying the food in the sun
D、dressing the food
答案
B
解析
这是道细节题。这道题目需要注意的是考题出的比较有技巧。这道题目问的是从句里面的内容,问腌制食品使用的方法是什么?从文中最后一段整段话来看,腌制东西时也是把食物的水分去掉从而保持食物,文中最后一段指出和直接晒干保存食物的方法相比,这种方法对食品的蛋白质损害更小,而且不像直接烘干的那样,这样还有一个好处就是全面干,不仅仅是表面干。所以这道题目的答案是B。
转载请注明原文地址:http://tihaiku.com/zcyy/3915367.html
相关试题推荐
Thenewlawrepresentsrecentandcurrentrequirementsfornewfoodadditivesan
WhydopeoplelivinginSaoPaulousebroomsinstead?[br][originaltext]Lan
Alllivingcellsonearthrequiremoisturefortheirmetabolism.Cerealgrai
Alllivingcellsonearthrequiremoisturefortheirmetabolism.Cerealgrai
Alllivingcellsonearthrequiremoisturefortheirmetabolism.Cerealgrai
Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmuni
Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmuni
Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmuni
Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmuni
Fromthehealthpointofviewwearelivinginamarvelousage.Weareimmuni
随机试题
Karaokemayneverbethesame,thankstoresearchbeingpresentedinNashvil
Pygmalionisaplayby______.A、WilliamShakespeareB、OscarWildeC、GeorgeBerna
Sinceabout1800,nearthebeginningoftheindustrialrevolution,coal,pet
假设某商业银行的总资产为1500亿元,总负债为1350亿元,现金头寸为70亿元,
A.肝火亢盛B.心火上炎C.心火下移小肠D.心火亢盛E.火热内闭心神高热烦渴,神
招标人采用邀请招标方式的,应当向()个以上具备承担招标项目的能力、资信良好的特
男性,40岁,乘坐公共汽车时右腿搁在左大腿上,突遇车祸,向前冲撞倒地,右髋疼痛,
采用提高功率因数的节能措施,可达到下列哪些目的?()A.减少无功损耗 B.减
提高车间电力负荷的功率因数,可以减少车间变压器的哪些损耗?()A.有功损耗
A.高压蒸气灭菌 B.紫外线 C.干烤 D.煮沸消毒 E.滤过除菌动物免
最新回复
(
0
)