It is the world’s fourth-most-important food crop, after maize, wheat and rice. It provides more calories, more quickly, using less land and in a wider range of climates than any Other plant. It is, of Course, the potato. The United Nations has declared 2008 the International Year of the Potato. It hopes that greater awareness of the merits of potatoes will contribute to the achievement of its Millennium Development Goals, by helping to alleviate poverty, improve food security and promote economic development. It is always the international year of this or month of that. But the potato’s unusual history means it is well worth celebrating by readers of The Economist because the potato is intertwined with economic development, trade liberalisation and globalisation. Unlikely though it seems, the potato promoted economic development by underpinning the industrial revolution in England in the 19th century. It provided a cheap source of calories and was easy to cultivate, so it liberated workers from the land. Potatoes became popular in the north of England, as people there specialised in livestock farming and domestic industry, while farmers in the south (where the soil was more suitable ) concentrated on wheat production. By a happy accident, this concentrated industrial activity in the regions where coal was readily available, and a potato-driven population boom provided ample workers for the new factories. Friedrich Engels even declared that the potato was the equal of iron for its "historically revolutionary role". The potato promoted free trade by contributing to the abolition of Britain’s Corn Laws-the cause which prompted the founding of The Economist in 1843. The Corn Laws restricted imports of grain into the United Kingdom in order to protect domestic wheat producers. Landowners supported the laws, since cheap imported grain would reduce their income, but industrialists opposed them because imports would drive down the cost of food, allowing people to spend more on manufactured goods. Ultimately it was not the eloquence of the arguments against the Corn Laws that led to their abolition-and more’s the pity. It was the tragedy of the Irish potato famine of 1845, in which 1million Irish perished when the potato crop on which they subsisted succumbed to blight. The need to import grain to relieve the situation in Ireland forced the government, which was dominated by landowners who backed the Corn Laws, to reverse its position. This paved the way for liberalisation in other areas, and free trade became British policy. As the Duke of Wellington complained at the time, "rotten potatoes have done it all. " In the form of French fries, served alongside burgers and Coca-Cola, potatoes are now an icon of globalisation. This is quite a turnaround given the scepticism which first greeted them on their arrival in the Old World in the 16th century. Spuds were variously thought to cause leprosy, to be fit only for animals, to be associated with the devil or to be poisonous. They took hold in 18th century Europe only when war and famine meant there was nothing else to eat; people then realised just how versatile and reliable they were. As Adam Smith, one of the potato’s many admirers, observed at the time, "The very general use which is made of potatoes in these kingdoms as food for man is a convincing proof that the prejudices of a nation, with regard to diet, however deeply rooted, are by no means unconquerable. " Mashed, fried, boiled and roast, a humble tuber changed the world, and free-trading globalisers everywhere should celebrate it. According to the text, what are the features of potatoes
A. Lower price, quicker growing speed, less land required, and wider range of climate.
B. More calories, quicker growing speed, less labor required in growing and processing, and wider range of climate.
C. More calories, quicker growing speed, less land required, and wider range of climate.
D. More calories, quicker growing speed, less land required, and wider range of products to be made of.
Once you decide to choose a topic to write an effective paragraph, the first key to write a good topic sentence. The topic sentence does two things: it tells the reader what the topic of the paragraph is, and it says something about that topic. What the topic sentence says about the topic is called the controlling idea; it is the point of the paragraph, and every other sentence in the paragraph must be related to this point.The topic sentence should be the first sentence in the paragraph unless there is some special reason for placing it somewhere else. When the topic sentence is the first sentence of the paragraph, the reader immediately knows what you intend to discuss. In addition, you have the topic sentence to refer to as you make each of the other sentences in the paragraph, so that you can be sure that each of those sentences refers to your subject and to your controlling idea. Sometimes experienced writers put the topic sentence at the end of the paragraph or even in the middle to create some kind of special impression; but while you are still learning to write effective paragraphs, it is safest to put the topic sentence at the beginning unless you have a special reason for doing something else.A good topic sentence is a clear, definite statement with a limited and special topic and a limited and specific controlling idea. It is usually placed at the beginning of the paragraph. Now that you have had some practice in identifying and constructing good topic sentences, we are ready to look at some of the basic principles that govern the composition of effective paragraphs. After reading it, we can reasonably believe that the passage()
A. is taken from a grammar book
B. is about paragraph writing
C. is trying to give advice
D. is a student’ s homework