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The day jeans were patented – level 1
20-05-1873Levi Strauss is from Germany. He comes to the United States...
The day jeans were patented – level 2
20-05-1873Levi Strauss was a German immigrant who came to the United...
The day jeans were patented – level 3
20-05-1873Levi Strauss was a German immigrant who came to the United...
The day of the first nonstop flight across the Atlantic – level 1
20-05-1927It is 1919. One businessman in New York wants to give...
The day of the first nonstop flight across the Atlantic – level 2
20-05-1927In 1919, a New York businessman announced a competition. He promised...
The day of the first nonstop flight across the Atlantic – level 3
20-05-1927In 1919, businessman Raymond Orteig announced a competition. He promised to...
The day Mount St. Helens erupts – level 2
18-05-1980In March 1980, there were several small earthquakes near Mount St....
The day Mount St. Helens erupts – level 3
18-05-1980On March 15, 1980, several small earthquakes indicated that magma may...
The day the Cultural Revolution started – level 1
18-05-1980Mao Zedong is the leader of China after World War II....
The day the Cultural Revolution started – level 2
18-05-1980After World War II, the leader of the Communist Party in...
