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【多选题】
根据短文内容,从下框的 A ~ F 选项中选出能概括每一段主题的最佳选项 ,
A.
Real winners of tourism
B.
Negative effects of tourism
C.
Growing tourism in the world
D.
Developing tourism with caution
E.
Benefits to the locals from tourism
F.
Tourism problems and possible solutions 1. ______ On the Mediterranean island of Majorca in Spain , the locals are angry. Too late. In the last quarter of the 20th century , they obtained profit from foreign visitors wanting to buy up property on their beautiful island. Suddenly it occurred to Majorcans that the island no longer belonged to them. Its 630,000 inhabitants (居民) are increasingly convinced that the 14 million visitors a year are far too much of a good thing. Water is in short supply , pollution is worsening , and there is no affordable housing left for them to buy. 2. ______ Tourism is the world’s largest and fastest growing industry. In 1950,25 million people traveled abroad ; last year it was 750 million. The World Tourism Organization predicts that 1.6 billion people , by 2020 , will travel each year , spending over two trillion (万亿) US dollars. 3. ______ The host country may not see many benefits. In Thailand, 60% of the $4 billion annual tourism income leaves the country. Tourists arranged by travel companies tend to stay at big foreign owned hotels , buying few local products. Mass tourism (团队旅游) usually leaves little money inside the country and most of the money goes to the airlines , the tour operators , and the foreign hotel owners , who are the final winners of tourism. 4. ______ These days the industry’s most urgent question may be how to control the flow of tourists. A typical example of this is Italy , where great cultural centers like Florence and Venice can’t handle all the tourists they get every summer. In Florence , its half million inhabitants have to live with the pollution , traffic jam , and crime caused by 11 million visitors a year. Now there’s talk about how to solve these problems , like raising hotel taxes , or even charging admission to some public squares. The idea is to discourage at least some visitors , as well as to pay for cleaning up the mess. 5. ______ For many poorer countries , tourism may still offer the best hope for development. The Vietnamese are doing their best to open up their country. Libya has paid $1 million for a study. They all want tourists. Yet if something isn’t done , tourism seems certain to become the victim of its own success. Its effect on the environment is a major concern. For this reason , tourist organizations need to have second thoughts about what exactly they are trying to sell.
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举一反三
【单选题】以下物质中,不属于基本培养基成分的是()
A.
无机营养
B.
碳源
C.
有机营养
D.
植物生长调节剂
【单选题】以下属于碳源的物质是
A.
尿素
B.
硝酸钾
C.
维生素
D.
淀粉
【单选题】肉芽组织转化为瘢痕组织的过程,错误的是
A.
毛细血管闭塞、数目减少
B.
胶原纤维增多
C.
成纤维细胞减少
D.
炎细胞增多
E.
间质的水分逐渐吸收减少
【简答题】私有密钥加密技术、公用密钥加密技术以及______是保证电子商务系统安全运行的最基本、最关键的技术。
【单选题】set使用多种密钥技术来达到安全交易的要求,其中核心是对称密钥技术、公钥加密技术、()。
A.
会话层密匙技术
B.
hash算法
C.
ca认证技术
D.
私匙加密技术
【单选题】公用密钥加密技术是电子商务系统中使用的主要加密技术之一,它主要用于私有密钥的分发和( ),以实现身份认证、信息完整性检验和交易防抵赖等。
A.
数字信封
B.
数字签名
C.
数字水印
D.
口令检测
【简答题】私有密钥加密技术、公用密钥加密技术以及______是保证电子商务系统安全运行的最基本、最关键的技术。
【单选题】关于残疾的定义叙述完整的是:
A.
因病,伤,残等造成的身心功能障碍,以致丧失生活,工作和学习能力的一种状态
B.
因疾病、外伤导致的身心功能障碍
C.
因精神因素造成的心理功能障碍
D.
因疾病造成的听力、言语障碍
E.
因发育缺陷造成的运动障碍
【单选题】以下属于碳源的物质是( )
A.
尿素
B.
硝酸钾
C.
氨盐
D.
淀粉
【单选题】肉芽组织转化为瘢痕组织的过程,错误的是
A.
毛细血管壁塞、数目减少
B.
胶原纤维增多
C.
成纤维细胞减少
D.
炎细胞减少
E.
间质的水分逐渐吸收减少
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