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Elections are the lifeblood of a democracy. The word democracy literally means “the people rule,” an important concept in America's history. In ...
In many jungle films, the gorilla is seen as a fierce hunter, much like the leopard or the lion. In recent years, many investigators of forest lif...
Although fish do not produce sound the same way that humans do, they are by no means silent. When scientists brought listening devices down under t...
Many studies have shown that people with education are more successful in their life careers. Yet many famous people had very little education. Mark...
The black belt is the highest level in karate. The student must master hundreds of skills to reach this high standard. The beginner must practice ...
Television sets are found in almost every American home. Nine out of ten Americans watch at least one television show a day. Children watch a great...
The cold is our most common disease. Millions of people suffer discomfort from one or more colds each year. The cause of this illness is a virus....
Many Americans enjoy watching sports. For many years the favorite sport in this country has been football. Football games draw a very large audience....
Primitive umbrellas have been used for more than 2,000 years. However, the type of umbrella we use today was designed less than 3 hundred years ago...
Wars kill millions of people. But war is not the only cause of large-scale death. 700 years ago a terrible disease called the Bubonic Plague killed...
A hurricane is a storm which can cause terrible destruction and death. Hurricanes bring tremendously strong winds, so strong they can knock down bui...
In the 20th century, machines are run mostly by electricity. Two hundred years ago electricity was not in common use. Machines were often run by wa...
Meat is kept fresh by storing it in refrigerators. However, there are other ways of keeping meat fresh. For example, it can be rubbed with salt or...
比较过去时与现在完成时 现在完成时可表示持续到现在的动作或状态，动词一般是延续性的，如live, teach, learn, work, study, know. 过去时常用的非持续性动词有come, go, ...
用于现在完成时的句型 1)It is the first/second time…. that…结构中的从句部分，用现在完成时。 It is the first time that I have visited the city. It w...
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