Cambodian people to preserve and display their history and culture.
Of course, we also see such pictures: some natural environment is destroyed and resources are overused due to redundant construction of tourist facilities and resorts. However, in the long run, as long as the number of tourists are controlled and tourist resources not over-exploited, this negative sides will not be a serious issue.
To sum up, international tourism brings economic and cultural benefits to those countries with rich tourist resources although they have to accept some environmental costs. (275 words)
变句练习（长短句变换）：
将下列的短句优化成长句或将长句优化成短句，使句式运用更加合理。
1.This causes the white pollution to our environment. Plastic bags cannot disappear by natural decomposition. So it is very harmful.
2.The grading system at our college should be abolished. The students don’t like to try to get grades. The instructors don’t enjoy giving grades.
3.The majority of today’s college students have little knowledge of social reality. This is a common weak point among them.
4.Wind is an enduring source of power. Water is also an unlimited energy source. Dams produce power. They have existed for a long time. Windmills are relatively new.
5.We must find new sources of energy. Natural sources of energy are decreasing. Solar energy is a promising new source of energy. Solar energy is energy from the sun.
6.As is known to all, jealousy is the killer of friendship and harmony, which exists both in work and daily life and is hard to eliminate.
7.That Yang Liwe was selected as the first Chinese astronaut can best illustrate that opportunity prefers well-prepared persons.
8.By reading martial arts fictions, students can distinguish the right from the wrong, be firmly convinced that the righteous triumphs over the evil in the long run and set themselves to do good to others.
9.Some economists are in favor of the Holiday Economy, which, they believe, has many advantages, the first one of which is tourism-based Holiday Economy will raise consumption and therefore help to spur the domestic demand.
10.One reason why I prefer a student-oriented class to a teacher-oriented one is that it can make my knowledge permanent, in addition to which, it can develop my creative mind and my learning ability.
练习四：
Teamwork is very important in the modern society and today’s leader is usually the one sitting at a table with six others, sleeves rolled up, trying to solve a problem together.
The Importance of Teamwork
......
I believe that teamwork is more important in the modern society and teamwork spirit has become a required quality by more and more companies. To start with, with the help of the team, the tasks can be completed quickly and efficiently. Situated in an increasingly complicated society, we often encounter tough problems that are beyond our abilities. Today's society is no longer a self-sufficient one，but one in which all the people depend on each other for existence. At work，one can almost accomplish nothing without joint efforts．Every loaf of bread，every article of clothes，every house or apartment，every means of transportation is the product of cooperative efforts.
Besides, teamwork contributes to the prosperity of the companies. Teamwork provides a cooperative, friendly and enjoyable work environment, which is an important factor influencing employees’ belief in the company as a good workplace. With all people’s knowledge combined, the companies possess high work efficiency and an ability to deal with whatever problems. This allows the company to take on more work and generate more revenue without having to add more staff. As a result, the companies can make more profits and develop more quickly.
练习五：
In recent years, more and more security cameras are installed in public places. Discuss both the benefits and problems resulting from these cameras.
On Security Cameras
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As far as I am concerned, there are both benefits and problems brought by these cameras....... ......................................................
On one hand, cameras installed in public places contribute to public order. As we all know, the public places are the hotbeds of various crimes, especially of stealing and robbery. With the surveillance cameras, the criminals can be restrained more or less because in case they commit the crimes, the public security organs can obtain on-spot clues from the video data. What’s more, security cameras in public
help establish a good image of the city. With the aid of these cameras, the urban management officers can finally end the cat-and-mouse game with the street vendors who set up stands here and there and help project an orderly new image of the city.
On the other hand, the individual privacy may be invaded if people’s behaviors are monitored. The cameras can be seen everywhere, and even schools have started using spy cams to watch students’ activity and behavior. The cameras are so common now that we hardly ever even notice them．But the problem lies with the ones that are hidden away from our eyes and are unseen．It is these spy cams that people feel are an invasion of privacy. After all, there are no strict rules in our country as to who takes charge of surveillance cameras and how to deal with the data.
Therefore, it is quite clear that installing security cameras in public has merits as well as demerits. Taking both of them into account, I suggest that strict measures should be taken by the supervision department to ensure that security cameras will not be misused or abused.
练习六：
Magic has captivated audience for centuries. Recently, there is a heated debate about the disclosure of magic.
Should the Secrets Behind Magic Be Disclosed?
…I insist that the secrets behind the magic should be disclosed.
For one thing, it contributes to developing the interest of the magic lovers in magic. With a fascination with magic, some people, especially the beginners, thirst for the revelation of the magic secrets so that they may obtain some of the know-how and perform some magic on their own. If the magic secrets are disclosed, it can attract more and more people to learn the skills and help them demonstrate it successfully. Consequently, with the practice on the rise, people will show their interest in more magic performances.
For another, the magic secrets disclosure can somewhat push the magicians to create more magic tricks. As one of the traditional cultures, magic needs to be continually renewed and innovated. With the magic secrets disclosed, the magicians have to rack their brains to improve and perfect the magic shows. If not, not only will they lose their audience, but also lose their creation abilities. To attract more people, the magicians have to create more fresh, fancy and novel magic tricks. In the meanwhile, their abilities of magic shows will also be constantly improved.
样题解析（图表和文字材料的写作）：
You are doing a mini research project on Internet users. The following are some useful materials. Write a report of about 200 words. Your report should mainly be made up of two parts. In the first part, you describe the graph. In the second part, you analyze the relevant situation. You should also provide an introduction and conclusion for your report.
The Use of the Internet（题目说明图表分析内容）
How many people have an Internet connection? In the following, some data will be used to illustrate the percentage of people in three countries who used the Internet between 1999 and 2009. （要说明什么问题）
It is clear that the number of Internet users has increased greatly from 1999 to 2009. Overall, more Internet users lived in Canada and America in comparison with those in Mexico, and Canada experienced the fastest growth in Internet usage. （说明图表整体情况）
In 1999, the number of American people accessing the Internet was about 20% while the figure for Canada was much lower, at about 10%. In 2002, Internet usage in Canada surpassed that in the USA and rose to around 50% of the population. By 2009, Canada became the country with the highest percentage, at almost 100%, followed by America, with about 80%. In the meanwhile, the number of Internet users in Mexico just underwent a steady growth from around 5% in 1999 to 40% in 2009. （具体描述图表内容）
Obviously, from the above graph, even though there were more Internet users in America and Canada than in Mexico, the total number of population using the Internet showed an upward trend. It turns out to provide solid evidence that the Internet has been growing increasingly popular. （总结分析的内容）
练习七：