关键词：考研英语，每日一练，阅读理解
今日练习：阅读以下英文短文，回答问题。
In the past, people used to believe that the world was flat. However, as we know, the world is actually round. This change in understanding has had a significant impact on our lives and the way we perceive the world.
The discovery of the Earth's roundness was not an easy task. It required extensive research and experimentation. Over centuries, scientists and explorers have gathered evidence to support the theory that the Earth is round. This knowledge has led to advancements in navigation, geography, and our understanding of the universe.
One of the most famous experiments to prove the Earth's roundness was conducted by Galileo Galilei. In 1610, he observed the phases of Venus, which vary depending on the position of the Earth in relation to the Sun. This observation provided clear evidence that the Earth is round.
The realization that the Earth is round has also had practical implications. Navigators use the knowledge of the Earth's curvature to calculate distances and plot courses for ships and airplanes. This has made long-distance travel and exploration possible.
Moreover, the understanding of the Earth's roundness has influenced our view of the universe. It has led to the development of theories about the solar system, the Milky Way, and the existence of other galaxies. This knowledge has expanded our horizons and deepened our appreciation for the vastness of the cosmos.
Questions:
1. What was the traditional belief about the shape of the Earth?
2. What evidence did Galileo use to support the theory that the Earth is round?
3. How has the knowledge of the Earth's roundness affected navigation and exploration?
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