In many people's opinion, man's first real invention,{#blank#}1{#/blank#}is also one of the most important inventions in history, is the wheel. All transportation and every machine in the world depend{#blank#}2{#/blank#}it. The wheel is the{#blank#}3{#/blank#}(simple) yet perhaps the most remarkable of all{#blank#}4{#/blank#}(invention) because there are no wheels in nature.{#blank#}5{#/blank#}, then, did man come to invent the wheel? Perhaps some early hunters found that the body of {#blank#}6{#/blank#}heavy animal could be rolled through the forest on logs (圆木) more{#blank#}7{#/blank#}(easy) than they could carry it. However, the logs{#blank#}8{#/blank#}them) weigh a lot.

    It must have taken a great prehistoric thinker to imagine two thin slices of log connected, at their centers by a string stick. This would roll along just {#blank#}9{#/blank#}the logs did, yet be much lighter and easier{#blank#}10{#/blank#}(handle). Thus the wheel and axle came into being and with them the first carts.

    On a clear February morning, a California black bear was set free. Looking around, he {#blank#}1{#/blank#}(skillful) climbed the nearest tree. From high above the ground, he could see the hundreds of acres{#blank#}2{#/blank#}were now his home. His eyes were filled with {#blank#}3{#/blank#}(curious)

The bear had come a long way. Last fall, the seven-month-old bear bub(幼兽) was found all alone. He had no mother to care for him. He was thin,{#blank#}4{#/blank#} (weight) only 20 pounds—-about half the normal weight for a bear that age. Luckily the bub{#blank#}5{#/blank#}(bring) to The Fund for Animals Wildlife Center in Ramona, California. At the center, the bub shared{#blank#}6{#/blank#} outdoor enclosure(围栏) with another bear. There were trees to climb and places for them to dig dens(兽穴).{#blank#}7{#/blank#} (teach) the cub to find his own food, people working at the center {#blank#}8{#/blank#}(hide) fruit in tree branches. Soon, the bear was an expert at climbing trees and "picking" the fruit. All the staff felt{#blank#}9{#/blank#}(amaze) at his adaptability.

Finally, the day had come. With his new skill and strong body, the bub was ready to be{#blank#}10{#/blank#}his own, and ready to live like a bear should— in the wild.

    The Chinese language is one of the{#blank#}1{#/blank#}（old）written languages in the world. It {#blank#}2{#/blank#}（speak）by the Han majority and many other ethnic groups in China. Nearly 1.3 billion people speak some form of Chinese as their first language.

    The{#blank#}3{#/blank#}（vary）of Chinese are usually described by native speakers as dialects of a single Chinese language，but linguists（语言学家）note that they are as diverse as a language family. There are between 7 and 13 main regional groups of Chinese, of{#blank#}4{#/blank#}the most spoken by far is Mandarin（普通话），{#blank#}5{#/blank#}（follow）by Wu, Min, Yue, etc. Standard Chinese is a standardized form of spoken Chinese based on the Beijing dialect of Mandarin. It is{#blank#}6{#/blank#}official language of China, and also one of the six official languages of the United Nations.

    {#blank#}7{#/blank#}many Chinese dialects exist，the written language is still a very common form of communication. If we go to{#blank#}8{#/blank#}（differ）provinces, we may not be able {#blank#}9{#/blank#}（communicate）with the local people orally. However, we can understand each other in writing. The written language can be further divided{#blank#}10{#/blank#}different forms, like simplified Chinese and traditional Chinese. There is also a form called "pinyin", which is the Chinese language with a Roman spelling.

Dragon Heads­raising Day, {#blank#}1{#/blank#} falls each year on the second day of the second lunar month, is one of the Chinese traditional festivals. As the proverb goes, "The dragon is awake, {#blank#}2{#/blank#} (raise) its head." On this day, dragons, a prominent totem (图腾) in Chinese culture raise {#blank#}3{#/blank#} (they) heads with the sound of thunder. Around this time, the earth {#blank#}4{#/blank#} (burst) with life. Grass and trees are beginning to shoot up. In ancient China, people {#blank#}5{#/blank#} (pray) beside a river or a lake for the precious spring rain to breed their crops.

{#blank#}6{#/blank#} (tradition), food eaten on this day was renamed after parts of the dragon. For instance, wontons were called "dragon's eyes". The special {#blank#}7{#/blank#} (food) usually eaten on this day include dragon's scales, popcorn and pig's heads.

In Shanxi, people get their hair {#blank#}8{#/blank#} (cut) in a symbolic move to remove the old and embrace the new. In {#blank#}9{#/blank#} countryside in Hebei Province, people would fetch water from a well at dawn. It was believed {#blank#}10{#/blank#} on this day the well was full of dragon eggs which would bring the collector a good harvest.