If you can find a tree which has been cut down，you will see many rings，or circles，on the base of the trunk.By learning to read these rings，you can find out about the tree's life.

    The number of rings tells you how old the tree is.Each year，new wood is formed on the outside of the tree.This new wood is light in color when the tree is growing in spring and summer，and dark in winter when the tree is not growing much.So，if you count the rings of dark­or­light colored wood，you can often find out how old the tree is.

    You can also tell which years have been good years and which years have been bad years.When the light­colored rings are very wide，it means that the tree has been growing quickly that year.If the rings are narrow，it has been growing slowly.If the rings on a tree trunk were greatly magnified，you would be able to see why the rings are light­colored when the tree is growing quickly and dark­colored when the tree is growing slowly.The tree trunk is made up of microscopic tubes，like some pipes，carrying water from the soil，through the trunk，and up to the leaves.They are wide and thin­walled when the tree is growing quickly and they are carrying a lot of water.They are narrow and stuck together when the tree is not growing so quickly.

    When a tree is old，the tubes in the centre of the tree don't carry water.The walls of the tubes have become thick with materials which have stuck along them over the years，forming a kind of wood called“heartwood”．This kind of wood is darker in color than the young，growing wood on the outside of the tree.

    You don't very often see whole tree trunks which have been cut across.But once you learn to read a cross section of the wood，you can see much more in wood which has been used to make boxes，houses and other things.

    In most wood，instead of seeing the trunk cut across，you are seeing it cut along its length.Because you don't see the whole tree，you can't tell how old it is.

Title：{#blank#}1{#/blank#} of a Tree

    If you think your vocabulary is weak, a little effort every day over six to nine months can go a long way in improving it. Here are some tips for increasing your vocabulary.

    {#blank#}1{#/blank#}. You may be comfortable reading a particular part of the newspaper but make an effort to read different articles on every page. The editorial (社论的) page is highly recommended not only for vocabulary but also for structuring and presenting thoughts.

    Make it a habit to read a new book every week. {#blank#}2{#/blank#}. You can consider becoming a member of the local library. Make a list of new words and look up their meanings in the dictionary.

    Watch English movies and television shows. It's an interesting way to enrich your vocabulary. {#blank#}3{#/blank#}.

    Use vocabulary cards. Vocabulary cards are used by students who are trying to learn many words in a short time. You can make your own cards by writing the word on one side and the meaning on the other side of a piece of paper. {#blank#}4{#/blank#}.

    Use the Internet. The Internet is an unlimited resource for reading material.

    {#blank#}5{#/blank#}. You will come across plenty of material to read. The Internet will also introduce you to new words. Be sure to look them up in a dictionary.

    Choosing the right university for you is a big decision with many factors to consider. The institution that you choose will not only be the one that ensures your academic goals, but it will also be where you will live, learn, play sports, socialize and work for several years. Therefore, before you start filling out those university application forms, take a step back and consider the many variables that affect the “fit” of a university to your unique personality and educational goals. Take a look at the following factors, and decide which ones mean the most to you.

    Consider your educational goals. You will discover that different schools are  more recognized or progressive in your chosen field of study than others. For this reason, talk to advisors, professionals in your field, or go to clubs organized by the alumni(校友). When you check out school ranking for your major, you may find that your first choice is not really a match, while another fits perfectly.

    Consider costs. It will be no surprise to you at this point that not all schools cost the same. Some of the more famous schools are so because they are difficult to get into and difficult to pay for. Don't let this necessarily stop you. Just keep this consideration in mind as you narrow your list of potential schools.

    Choosing a university should not be done only on reputation, but also take the academic programs and overall environment into consideration. Be aware that reputations are sometimes out of date or overstated, so first-hand experience is often beneficial.

    Once you've identified the factors that are most important to you, you've taken the first steps towards making a successful choice. Make sure you pick a university that will serve your needs throughout your university career.

    Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did do. So start off to travel around the world and to experience a lot.

    Enjoy much freedom.

    You will enjoy a much greater sense of freedom when no one is able to tell you what to do{#blank#}1{#/blank#}You decide where you want to go,what you want to do and how long you want to stay.

    Taste delicious food.

    {#blank#}2{#/blank#}Do you like eating Chinese,Thai or Indian food?You will enjoy the food even more when you eat it from the place it originates（起源）.For foodies（吃货）,delicious food in different places on the journey is what attracts them most.

    Meet new people.

    You will have the chance to meet new people when you travel.Some are interesting,some boring,and some totally crazy.{#blank#}3{#/blank#}Chances are that it will be worth listening to.Perhaps you will meet someone you can make friends with and get a life-long friendship.

    Appreciate beautiful nature.

    Instead of looking out your office window to see a hundred skyscrapers staring back at you,you will get the chance to see the world in all its natural beauty.{#blank#}4{#/blank#}You can walk throw the jungles of the Amazon.You can see most scenery with your own eyes instead of looking at a still image in a book.

    {#blank#}5{#/blank#}You might already be book-smart.But add street smart to your life and then there's no stopping you.Travelling teaches you many of life's lessons.You will gain pearls（珍殊）of wisdom along your journey,which will surely enables you to lead a smarter life.

A.You are the boss.

B.Live a colorful life.

C.Become street-smart.

D.Everyone has a story to tell.

E.You can see the deserts of Africa.

F.You will discover how simple life can be.

G.You will taste food from all corners of the world.

    The Silk Road was a historical network of trade routes that connected China and the Mediterranean Sea, allowing cultural and economic interaction between the East and the West. Begun in the 2nd Century B C, the Silk Road carried goods, ideas, and even illness for thousands of miles between great civilizations for more than a thousand years. {#blank#}1{#/blank#} It was the creation of Germany's Ferdinand von Richthofen, who traveled to China several times in the second half of the 19th Century.

    China's powerful Han Dynasty began expanding its trade routes towards the West in the years around 100 B.C. {#blank#}2{#/blank#} Some shipments made it through to Europe and to northern and eastern Africa, through the port of Alexandria.

    As its name suggests, the Silk Road was home to large amount of silk, which made its way from China to the Mediterranean and, to Rome. It wasn't only silk, however, that was carried along the Silk Road  {#blank#}3{#/blank#} Chinese traders brought delicate porcelain plates and thin but durable paper money. Romans brought delicately carved pottery (陶器）and jewelry to China.

    {#blank#}4{#/blank#} Merchants carried shipments from major center, and then others carried the foods farther on the route. Many merchants traveled in groups, called carvans (商队). Many carvans and individual merchants traveled with bodyguards because theft along the routes was not uncommon.

    Several cities along the Silk Road became major trading centers. Some of the more famous of these were Alexandria, Karakorum, Antioch, Constantinople, and Persepolis. Local taxes placed on goods traveling along the route were quite common. {#blank#}5{#/blank#}

A. The name, however, is a modem idea.

B. Diseases also spread along the Silk Road.

C. It sent silk and other goods to other civilizations.

D. Merchants would prepare some supplies in advance.

E. Goods did not travel with the same person all along the route.

F. As a result, many goods traveled only part of the way due to the high cost

G. Many other things made their way from the East to the West, or from the West to the East.

Dear Mum,

    Today I went to a conference. In the conference, ⑴两个学生就因特网的优缺点进行了辩论。They made diverse points about the Internet that I had never thought about before. For example, some experts think that⑵花过多的时间上网的后果就是很难建立社会联系。 They were also quite explicit about how heavy Internet users spend more time with their Internet friends than with their real­life friends from school and work. ⑶This is another drawback of the Internet that alarms me. They addressed good points of the Internet, as well. For example, with the Internet, up­to­date information is only a click away. ⑷We can also correspond with people in distant places. This is very important for disabled people who can't always leave their homes.

    ⑸Both sides presented lots of statistics to support their arguments. My own judgement is that the Internet is beneficial. Otherwise, I would unable to write this e­mail to you!

Love from your son,

Xiaokun

⑴{#blank#}1{#/blank#}⑵{#blank#}2{#/blank#}⑶{#blank#}3{#/blank#}⑷{#blank#}4{#/blank#}⑸{#blank#}5{#/blank#}