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爆破基坑应根据土壤性质、药量、爆破方法等规定危险区。石坑危险区半径应为()。
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According to the passage， authors who write to inform. want to________.
根据下面内容，回答题：
Have you ever wondered why authors write？ Sometimes they are inspired to create stories. Other times they write to provide information about an interesting topic. Some authors write to convince us about something. Whatever the circumstances， authors have reasons for writing; this is called， the "author"s purpose. " The three most common types of author"s purpose are: to entertain，to inform， and to persuade.
Think about the last time a story made you laugh， cry， or tremble with fright. These types of stories are written with a particular purpose in mind: to entertain the reader. Authors write many kinds of stories to entertain， including humorous fiction， realistic fiction， fantasy， fairy tales， and fables. While fiction entertains， non-fiction has a different purpose.
Many non-fiction writings or texts are written with the purpose of giving information about an interesting topic. Authors who write to inform. must research their subject to ensure that they convey accurate information to the reader. Some examples of texts that inform. are encyclopedia entries， news articles， expository non-fiction books， and interviews. All of these types of writing give information about certain topics.
Sometimes authors write because they want to convince their readers about something. This is called argumentative， or persuasive writing. Oftentimes， texts that are meant to persuade use specific techniques to make the reader care about the subject， and to think about it in a certain way. These techniques might be found in letters to the editor， argumentative essays， or persuasive speeches.
Next time you read a text， see if you can figure what the author is trying to tell you. It might be easier than you think. Just ask yourself: what is the author" s purpose？
Which of the following is most likely the title of a passage in which the author‘ s purpose is to entertain ？ 查看材料
任何情况下，频率超过50±0、2Hz的持续时间不得超过();频率超过50±0、5Hz的持续时间不得超过()。
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