An unmanned aerial vehicle (UAV), commonly known as a drone and also referred by several other names is an aircraft without a human pilot aboard.AVs are being developed and deployed by many countries around the world. Due to their fast proliferation, there is no comprehensive list of current UAV systems or current holders. For a list of models by country, see: List of unmanned aerial vehicles.
Writing Effective Introductions. Great writers know that effective and impacting essays begin with an interesting and engaging. introduction that reveals their thesis and purpose, while capturing the readerâs attention. Introductions help writersâ¦. â Reveal their essayâs central idea or thesis. â Guide readers to important ideas in the body of the essay.
There are many ways to present an introduction. Here are a few: 1  Asking questions to get the students thinking about the topic of the lesson. 2  Showing pictures that relate to the lesson topic. 3  Telling a story to show the importance of the topic.  Bringing in realia (real objects) related to the lesson.