The hamburger is the most popular food item in the United States. Every year Americans consume billions of them. They are sold in expensive restaurants and in humble dinners. They are cooked at home on the kitchen stove or over a barbecue grill in the backyard. Why are they so popular?
First, a hamburger is extremely easy to prepare. It is nothing more than a piece of ground beef, cooked for a few minutes. Then it is placed in a sliced bun. Nothing could be simpler. Even an unskilled cook can turn out hundreds of them in an hour. Besides that, the simple hamburger can be varied in many ways. You can melt some cheese on top of the beef to create a cheeseburger. You can also add some grilled bacon for an interesting flavour contrast. In addition, you can garnish the hamburger with other things such as lettuce, tomato, onion, mushrooms, avocado, pickles, hot pepper, ketchup, relish, mayonnaise, mustard or whatever you wish!
There are a number of ways for us to keep fit. First, no matter how busy we are, we should have exercise every day to strengthen our muscles. Second, it is important to keep good hours. For example, if we are in the habit of going to bed early and getting up early, we can avoid overworking ourselves and get enough sleep. Finally, entertainment is also necessary so that we may have some moments of relaxation. If we follow those instruction，we will certainly be in good health.
The older form of communication is speech. In the beginning of human history, people could only use direct verbal speech to communicate. But it had many shortcomings. For instance, we could not speak to a person far away when we needed. So distance was a problem. And the spoken word could not be kept secret easily. So people wanted to invent a new method of communication. The next big step forward in communication was the invention of writing. Writing is one of human being’s most important inventions. It solved the problem of distance and keeping secrets, but it too had disadvantages. The written word could not be passed on quickly, so people tried to find a new quicker method of communication.
The most recent development had been electronic means of communication, including the wireless telegraph, radio, telephone and television. The invention and use of electronic means has solved all the problems mentioned above. They are the most effective methods of communication. People will certainly try their best to invent even more modem and useful methods.
This is supposed to be an enlightened age, but you wouldn’t think so if you could hear what the average man thinks of the average women. Women won their independence years ago. After a long, bitter struggle, they now enjoy the same educational opportunities as men in most parts of the world. They have proved repeatedly that they are equal and often superior to men in almost every field. The hard-fought battle for recognition has been won, but it is by no means over. It is men, not women who still carry on the sex war because their attitude remains basically hostile. Even in the most progressive societies, women continue to be regarded as second-rate citizens. To hear some men talk, you’d think that women belonged to a different species!
An important part of police strategy, rapid police response is seen by police officers and the public alike as offering tremendous benefits. The more obvious the abilities of police to apply first aid life saving techniques quickly are, the greater likelihood of arresting people who may have participated in a crime. It aids in identifying those who witnessed an emergency or crime as well as in collecting evidence. The overall reputation of a police department too is enhanced if rapid response is consistent and this in itself promotes the prevention of crime. Needless to say rapid response offers the public some degree of satisfaction in its police force.
At present rates of demand, the world has enough oil to last for more than 40 years, enough gas for more than 60 years and enough coal for more than 230 years. Naturally, demand will increase; but so will reserves as companies explore more widely and costs fall. Since 1970 viable reserves of oil have almost doubled while those of gas have leapt three-fold. One distant day a crunch will come, but as it approaches fossil-fuel prices will rise, making alternative forms of energy, perhaps including nuclear power, competitive. That is no reason to spend on nuclear now.
位于段中：位于段中的主题句起承上启下的作用，这类主题句多起转折作用，一般由“but, however, yet, anyhow, nevertheless”等词连接，用于引起下文。
What we teach ourselves sometimes, indeed, is more useful than what we learn from others. Some great men had little or no schooling. But these great men probably studied harder by themselves than most boys do in school. The greatest minds do not necessarily of those who have never been able to distinguish themselves at school, have been very successful in life later. It has been said that Wellington and Napoleon were both dull boys at school, and so were Newton and Albert Einstein.
Money may be deposited or withdrawn from branches of the credit unions and banks during business hours from Monday to Friday (but not on public holidays) or 24 hours a day from the many on-campus automatic teller machines. Business hours for financial institutions vary, but credit unions are usually open from 9 am to 5 pm weekdays, and, generally, banks are open from 9.30 am to 4 pm (5 pm on Fridays). Some services are available on Saturday mornings in selected areas. While prices often compare favorably with prices overseas, because Australia is a large and exciting country it is very easy to overspend, especially if on a tight budget.
空泛：English language is very important.
概括：English language is very important in our daily life.
空泛：The Olympic Games are exciting.
概括：In the Olympic Games the football teams from many countries compete intensely.
简洁：Collecting stamps is her hobby.
复杂：She likes collecting stamps which is her hobby.
简洁：I enjoyed watching Gone with the wind very much.
复杂：Gone with the wind was a good film which I enjoyed watching very much.
不完整：How to write a composition.
完整：How to write a composition is not an easy thing to talk about.
不完整：If the weather had been fine.
完整：If it had been fine, we would have had a good time.
because, since, as, seeing that, the reason why…, because of, on account of , due to, so, thus, hence, therefore, accordingly, consequently, so that, as a result of, in consequence of, result in, result from, lead to, so…as to, owing to, to have an effect on, for the reason, in this way等。
for example, for instance, for one thing, for another, to illustrate, one example is, to begin with, first, second, furthermore, besides, in addition, moreover, finally, in conclusion, in summary, also, a case in point, as an illustration, incidentally, namely, that is等。
similarly, likewise, like, too, equally important, the same as, in common, in the same way, on the contrary, on the one hand, on the other hand, otherwise, in sharp contrast, whereas, rather than, conversely, instead, in/by contrast, but, however, yet, nevertheless
to divide…into, to classify…into, group…into, to fall into classes, there are…kinds(types, groups, classes, categories, sorts ) of, according to, in terms of, depending on, at the level of等。
what is …？, to be defined as, to refer to, the definition of …is…, to be used to describe, in a very real sense, this is, this means, be explained, it states that, in other words, namely等。
generally speaking, generally, as a general rule, in general, on a larger scale, to take the idea further, to take the above opinion to an extreme, in a sense, in one sense, in a way, to some extent, in my opinion, in my view, as for me, as far as I am concerned, obviously, undoubtedly, in terms of, in conclusion, in short, in brief, in summary, in a word, on the whole, to sum up, to conclude.
anyway, certainly, surely, obviously, to be sure, especially, particularly, above all, indeed, in fact, even worse, needless to say, most important of all, no doubt
beyond, above, under, nearby, outside, in here, across, close to, on(to, at)the left(right), ahead of, in front of, above, from, adjacent to, against, around, at the bottom, before, behind, below, beneath, between, beyond, close at hand, close to down, far, farther, in the centre of, in the distance, in the middle of, nearby, near to, next to, on the opposite side, opposite to, on top of , over, under, up等。