题目

   When you read an article you will understand and remember it better if you can work out how the writer has put the ideas together．Sometimes a writer puts ideas together by asking questions and then answering them．For example，if the article is about groundhogs（土拨鼠），the set of questions in the writer’s head might be：    What does a groundhog look like？    Where do groundhogs live？    What do they eat？…    In the article，the author might answer those questions．   Sometimes an author writes out her questions in the article．These questions 直线y=2x-6与x、y轴围成的三角形的面积为99．