Unfortunately, although the Earth was flat, no one was able to figure out its size. Gradually, however, people began to realize that the Earth was really round.Then, in the third century BC (2,300 years ago), a Greek man named Eratosthenes had an idea. Eratosthenes was sure that the E...
Even in today's highly toxic political world, he learned a few very interesting things. One finding was that ordinary Americans like the Chinese people. Another thing he learned was that ordinary Americans value Chinese culture and traditions. A third interesting point that emerged from his survey...
the Moon, was formed. The most common theory, known as the Giant Impact Hypothesis proposes that the Moon originated after a body the size of Mars (sometimes named Theia) struck the proto-Earth a glancing blow
the Moon, was formed. The most common theory, known as the "giant impact hypothesis" proposes that the Moon originated after a body the size of Mars (sometimes named Theia) struck the proto-Earth a glancing
1. What do we know about the robot? A.It can recognize and respond to human emotions. B.It can develop new machines for children. C.Its color can be changed easily. D.Its material is very common.2. Who was one of the designers of the robot? A.Albert Einstein. B.Dr. Hanson. C...
Where was chicken No.4? The teachers looked and looked. They couldn’t find another chicken. After a few hours, they realized that the students had played another joke on them: There were only four chickens in the first place! They’ve been tricked by the numbers on the chickens. It’...
its size. Gradually, however, people began to realize that the Earth was really round. Then, in the third century BC (2, 300 years ago), a Greek man named Eratosthenes had an idea. Eratosthenes was sure that the Earth was a sphere. He used the sun and geometry(几何学) to figure ...
Early cultures used meteorites to craft weapons and jewelry long before anyone knew how to extract iron from ore.
CPlanet Earth is about 4,500 million years old. Geology(地质学) is about theEarth, how it was made, what it is made of and how it has changed over time.Why geology is important?Geologists study the history of our planet. They can also give us importantinformation about natural events ...
B. To wish the tourists a good trip. C. To introduce some places of interest. 五、听短文,根据短文内容完成图表中所缺信息。短文念三遍。(共5小题;每小题1分,计5分) The International Day of Families Date On 26 every year. Beginning...