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Boys and girls,
Nice to meet you! Today I'm very pleased to introduce to you my mother language ,Chinese.
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¡¾´ð°¸¡¿One possible version Boys and girls,
Nice to meet you! Today I'm very pleased to introduce to you my mother language, Chinese.
Chinese is an ancient and beautiful language and about one in five people in the world use Chinese as their communication tool.
There are some differences between oral Chinese and written Chinese. However, if you can speak Putonghua, you can communicate with others very well in China.
With the development of China, now more and more people in other countries are beginning to learn Chinese. It's very useful and convenient to speak fluent Chinese when you travel and do business in China.
Thank you.

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Some of the world's most significant problems never hit headlines. One example comes from agriculture. Food riots £¨±©¶¯£©and hunger make news. But the trend lying behind these matters is rarely talked about. This is the decrease in the growth in production of some of the world's major crops. A new study by the University of Minnesota and McGill University in Montreal looks at where, and how far, this decline is occurring.
The authors take a vast number of data points for the four most important crops: rice, wheat, corn and soybeans. They find that on between 24% and 39% of all harvested areas, the improvement in production that took place before the 1980s slowed down in the 1990s and 2000s.
There are two worrying features of the slowdown. One is that it has been particularly sharp in the world's most populous countries, India and China. Their ability to feed themselves has been an important source of relative stability both within the countries and on world food markets. That self-sufficiency (×Ô¸ø×Ô×ã) cannot be taken for granted if productions continue to slow down.
Second, production growth has been lower in wheat and rice than in corn and soybeans. This is problematic because wheat and rice are more important as foods, accounting for around half of all calories consumed. Corn and soybeans are more important as feed grains. The authors note that ¡°we have preferentially focused our crop improvement efforts on feeding animals and cars rather than on crops that feed people and are the basis of food security in much of the world.¡±
The report also states the more optimistic findings of another new paper which suggests that the world will not have to dig up a lot more land for farming in order to feed 9 billion people in 2050, as the Food and Agriculture Organization has argued.
Instead, it says, thanks to slowing population growth, land currently ploughed£¨À磩up for crops might be able to revert (»Ø·µ) to forest or wilderness. This could happen. The trouble is that the prediction assumes continued improvements in productions, which may not actually happen.
£¨1£©What significant problem does the writer think we should pay more attention to?
A.The decline of the grain production growth
B.News headlines in the leading media.
C.Food riots and hunger.
D.The food supply in populous countries.
£¨2£©Why does the author mention India and China in particular?
A.Their big populations are causing worldwide concerns.
B.Their food yields have begun to decrease sharply in recent years.
C.Their self-sufficiency is vital to the stability of world food markets.
D.Their food self-sufficiency has been taken for granted.
£¨3£©What does the new study by the two universities say about recent crop improvement efforts?
A.They fail to produce the same remarkable results as before the 1980s.
B.They contribute a lot to the improvement of human food production.
C.They play a major role in guaranteeing the food security of the world.
D.They focus more on the increase of animal feed than human food grains.
£¨4£©What does the Food and Agriculture Organization say about world food production in the coming decades?
A.The growing population will greatly increase the pressure on world food supplies.
B.The optimistic prediction about food production should be viewed with caution.
C.The slowdown of the growth in yields of major food crops will be reversed.
D.The world will be able to feed its population without expanding the area of farmland.
£¨5£©How does the author view the argument of the Food and Agriculture Organization?
A.It is built on the findings of a new study.
B.It is based on a doubtful assumption.
C.It is backed by strong evidence.
D.It is open to further discussion.

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Secret codes£¨ÃÜÂ룩keep 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. Code breaking never lags£¨Âäºó£©far behind code making. The science of creating and reading coded messages is called cryptography.
There are three main types of cryptography. For example, the first letters of ¡°My elephant eats too many eels¡± spell out the hidden message ¡°Meet me.¡±
You might represent each letter with a number, for example. Let's 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 ¡°135520135.¡±
A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. For example, ¡°bridge¡± might stand for ¡°meet¡± and ¡°out¡± might stand for ¡°me.¡± The message ¡°Bridge out¡± would actually mean ¡°Meet me.¡± 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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Wi-Fi is a wireless networking technology used across the globe. A 1 misunderstanding is that the term Wi-Fi is short for ¡°wireless fidelity(±£Õæ¶È)¡±. However, this is not the case. Wi-Fi is 2 a trademarked phrase that uses the 802.11 standard, which was 3 by the Institute of Electrical and Electronics Engineers (IEEE). That is to say, instead of using 4, your computer is connected to the internet or other computers by radio.
This standard was 5 promoted by the Wi-Fi Alliance, a trade group that pioneered commercialization of the 6. A person or business can use a wireless router( ·ÓÉÆ÷) or a similar 7 to create a ¡°hotspot¡± or an area in which proper devices can connect wirelessly to a network or 8 Internet access. This router is usually connected to the Internet by 9 of a modem, often one 10 as a high-speed connection. Any user within about 200 feet of the 11 point can then connect to the Internet, 12 for good transfer rates, distances of 100 feet or less are often suggested. Salespersons also sell signal boosters£¨·Å´óÆ÷£©that 13 the range of a wireless network.
Wi-Fi networks can either be 14 or closed, in which case a 15 is needed. An area blanketed in wireless access through a device is often called a ¡°wireless 16.¡± Anyone with a device that 17 proper functionality can connect to this network while in the hotspot. Through this connection, a 18 network can be accessed or Internet connectivity can be achieved. This allows people within the hotspot to connect to the Internet via the router and modem, often 19 for employees at a business or as a free 20 at coffee shops and similar locations.
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