题目内容

【题目】九江麦德龙超市的乳品区,有大量的进口鲜奶出售,这些鲜奶来自法国、德国、荷兰、波兰、澳大利亚、新西兰等国。包装盒上标注的保鲜期为一年。据此回答下列各题。

【1】上述国家中,位于欧洲乳畜带的国家是

A法国、德国、波兰 B荷兰、波兰、新西兰

C澳大利亚、新西兰、法国 D荷兰、澳大利亚、德国

【2】鲜奶的保质期能长达一年,说明

A.鲜奶中加入了保鲜剂 B.鲜奶长期处于冷藏环境中

C.包装技术的进步 D.运输和售卖过程中的无菌环境

【3】新西兰的鲜奶不仅销往中国,也销往美国、加拿大等国,主要原因是

A交通条件的改善 B保鲜冷藏技术的发展

C新西兰奶的质量好 D巨大的市场需求

【答案】

【1】A

【2】C

【3】D

【解析】

试题分析:

【1】根据材料,位于欧洲乳畜带的国家是法国、德国、波兰,A对。新西兰、澳大利亚属于大洋洲,不属于欧洲,B.C.D错。

【2】鲜奶的保质期能长达一年,说明包装技术的进步,C对。不能说明鲜奶中加入了保鲜剂、鲜奶长期处于冷藏环境中、运输和售卖过程中的无菌环境A.B.D错。

【3】新西兰的鲜奶不仅销往中国,也销往美国、加拿大等国,说明市场广大,主要原因是巨大的市场需求,D对。交通条件的改善保鲜冷藏技术的发展新西兰奶的质量好,对产品销售有影响,但不是市场广阔的原因,A.B.C错。

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【题目】根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。

Secret codes (密码)keep messages private。Banks, companies, and government agencies use secret codes in doing business, especially when information is sent by computer.

People have used secret codes for thousands of years. 【1】 Code breaking never lags(落后) far behind code making. The science of creating and reading coded messages is called cryptography.

There are three main types of cryptography. 【2】 For example, the first letters of My elephant eats too many eels Spell out the hidden message Meet me.

【3】 You might represent each letter with a number, For example, Lets number the letters of the alphabet, in order, from 1 to 26. If we substitute a number for each letter, the message Meet me would read 13 5 20 13 5.

A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. 【4】 For example bridge might stand for meet and out might stand for me. The message bridge out would actually mean Meet me. 【5】 However, it is also hard to keep a code book secret for long. So codes must be changed frequently.

A.It is very hard to break a code without the code book.

B.In any language, some letters are used more than others.

C.Only people who know the keyword can read the message.

D.As long as there have been codes, people have tried to break them.

E.You can hide a message by having the first letters of each word spell it out.

F.With a code book, you might write down words that would stand for other words.

G.Another way to hide a message is to use symbols to stand for specific letters of the alphabet.

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