HOLIDAY HOMES IN MALLORCA Sailing and

题型:阅读理解

问题:


HOLIDAY HOMES IN MALLORCA
Sailing and fishing in summer season. Beautifully situated houses with sights of sea and mountains, yet near to shops and restaurants. Cars and bicycles for hire. Sailing and sports clubs nearby.
ITALY IN COMFORT
Coach trips of Italy with 21 days to visit five Italian cities. Start from London 1st May, 1st September. The trips are guided by Professor Martin Davis, head of Italian Studies, London University. See the arts and culture of historic Italy.
KIBBUTZ HOLIDAYS IN ISRAEL
Working holidays on a kibbutz (co-operative farm)in Israel. All nationalities welcome for one to three months, if prepared to work with kibbutz members. Rooms, food and trips to historic sights all provided free—you pay only for the special low-cost return flight.
TWO WEEKS ON A CARIBBEAN ISLAND
Two-week holidays in the Hotel Splendid, on a lovely beach with golden sands, warm sunshine and deep-blue sea. Tennis, golf, sailing and all water sports, trips around the island. Near to town of Castries with lively evening entertainment—dancing.
1 st November—31 st March   £720 per person
1 st April—30 th October     £850 per person
 Jack and his wife Mary, who have recently retired, want to see places of cultural and historic interest abroad, but Mary hates flying.
Peter and Maria, university students, want to travel as far as possible on little money, and would like to get to know a country by working there for three months with other young people.
Michael, a young computer programmer, has been working hard and needs a holiday to relax in winter. He would like to go somewhere warmer and sunny, where he can swim in the sea, and he enjoys sports and dancing.
小题1: The best holiday for Jack and Mary would be_________ .
A.the 21-day coach trip of Italy
B.the 2- week stay in the Hotel Splendid
C.the 14-day trip around a Caribbean island
D.1-3months’ holidays on a kibbutz in Israel
小题2:The most suitable place where Peter and Maria can enjoy their holiday would be_____.
A.an Italian cityB.a kibbutz in Israel
C.a Caribbean islandD.a port in Mallorca
小题3:Michael would most probably go to ________ for his holiday.
A.ItalyB.IsraelC.MallorcaD.a Caribbean island
小题4:Which of the following statements is NOT TRUE ?
A.In Italy, one can travel with a guide.
B.In Israel, one can work with others.
C.In Caribbean, one needs to pay £720 in summer.
D.In Mallorca , one can hire a car for sightseeing.
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题型:阅读理解

精加工的谷类,使儿童普遍缺乏维生素B1。( )

题型:阅读理解

人们装修家购买地板时,实质上购买的是对美好家庭生活的追求,这是地板的()。

A、核心产品

B、期望产品

C、潜在产品

D、形式产品

题型:阅读理解

酸奶不仅口感好,而且营养价值高,这主要是在牛奶中加入了某种菌,这种菌应是(  )

A.乳酸细菌

B.醋酸杆菌

C.酵母菌

D.棒状杆菌

题型:阅读理解

有营养的食品添加剂

元无心

①梨、苹果、香蕉、土豆等果蔬汁很容易变色。变色后不仅难看,味道也受到影响。怎么办?加点柠檬汁。

②果蔬中都含有多少不等的多酚化合物。去皮之后,这些化合物就暴露在空气中被氧化,生成醌(kūn)化合物。这种醌化合物很容易互相连接,成为“褐色素”,从而使这些食物变色。而柠檬汁中含有大量的“抗坏血酸”,它可以把醌还原为初始的多酚状态;也可以直接被氧化,从而消耗掉多酚周围的氧气,以此来保护多酚免受氧气的攻击。这样,抗坏血酸牺牲了自我,保护了脆弱的多酚,保持了果蔬“新鲜”的颜色。

③在食品工业中,人们根据柠檬汁的作用机理,就可以直接添加抗坏血酸。在超市销售的果汁和蔬菜汁,很多酒添加了抗坏血酸,以保持其外观和风味。

④抗坏血酸的作用不仅于此。人们在熟肉制品中经常会加入亚硝酸盐。亚硝酸盐有两种作用:一是与肌红蛋白反应,使之呈现诱人的红色;二是抑制细菌生长,实现防腐功能。加入抗坏血酸,可以促进前一个反应的进行,从而加快“发色”的过程。许多人认为亚硝酸盐是一种“致癌物”。其实,它本身并不致癌,只有当它与肉中的氨基酸反应,生成的亚硝胺才是一种致癌物。如果在肉中加入了抗坏血酸,它就会抑制这一转化过程的发生,从而降低亚硝酸盐“可能”的致癌风险。在不需要亚硝酸盐的肉类食品中,有时也会加入抗坏血酸。因为肉中油脂氧化会释放出不好的味道,也就是通常所说的“哈喇味”。如果加入了抗坏血酸,它就会抢先消耗周围的氧气,从而保护油脂不被氧化,有助于保持肉味的“新鲜”。

⑤抗坏血酸本身很容易被氧化,生成脱氧抗坏血酸。这些脱氧抗坏血酸并不甘于“败家”,会去夺取别人的氢原子来重建家园。人们利用这一特性,在面食加工中,常常加入抗坏血酸,改善面团性能,增加面团筋道。面粉中含有谷胶蛋白,其中有许多巯(qiú)基——就是带着一个氢原子的硫原子,脱氧抗坏血酸会掠夺其氢原子。当我们揉面时,巯基中的氢原子就会被脱氧抗坏血酸夺走,剩下的硫原子就会两两相连,形成所谓的二硫键。当大量的二硫键形成,面团中的谷胶蛋白就形成一个巨大的网络,从而增强其筋道。

⑥大多数情况下,食品添加剂都是为了改善风味、口感,增加食品稳定性等等,本身并不具有营养意义。但是抗坏血酸并不属于这个“大多数”。在作为食品添加剂的时候,它通常被叫做“抗坏血酸”。而它本身也是人体需要的营养成分——维生素C。维生素C不稳定,空气、光照、加热、与金属容器接触,都会使它失去活性或者分解。但是,正是它的这种不稳定,使它具有了良好的“抗氧化性”。在体内,它保护细胞免受氧化损伤。加到食品中,它舍己为人先被氧化,从而保护食品中的其它成分。      (选自《食品与生活》 有删改)

小题1:“有营养的食品添加剂”指的是什么?为什么说这种食品添加剂有营养?请结合文意,概括说明。(3分)

小题2:联系上下文,说说下列句子中划线词语的意思和表达作用。(4分)

(1)如果在肉中加入了抗坏血酸,它就会抑制这一转化过程的发生,从而降低亚硝酸盐“可能”的致癌风险。

(2)这些脱氧抗坏血酸并不甘于“败家”,会去夺取别人的氢原子来重建家园。

小题3:第③段文字在文中有什么作用?(3分)

小题4:你对食品添加剂及其使用有了怎样的认识?请结合文章内容作具体说明。(4分)

题型:阅读理解

下列关于关系模式规范化的叙述中,哪一条是不正确的

A.若R∈BCNF,则必然R∈4NF

B.若R∈BCNF,则必然R∈3NF

C.若R∈BCNF,则必然R∈2NF

D.若R∈BCNF,则必然R∈lNF

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