题目

如图，将△ABC沿着过AB中点D的直线折叠，使点A落在BC边上的A1处，称为第1次操作，折痕DE到BC的距离记为h1，还原纸片后，再将△ADE沿着过AD中点D1的直线折叠，使点A落在DE边上的A2处，称为第2次操作，折痕D1E1到BC的距离记为h2；按上述方法不断操作下去…，经过第2017次操作后得到的折痕D2016E2016，到BC的距离记为h2017；若h1=1，则h2017的值为    ．阅读理解。     It is not unusual at all for teens to answer their parents with one-word answers. "Where are you going?" "Places." "When will you be back?" "Sometime." "Who will you be with?" "People."      That means that the days of your children bounding in the front door with the details of their day are over. They are breaking away from you so that they'll be able to stand on their own as a young adult.      Some parents feel sad about this loss of their children's closeness. Of course you miss those conversationsand friendly talks. Once your children move out after high school and establish themselves confidently as a young adult, they'll come back for easy conversations and even ask for advice. But in order to determine whothey are right now they need to separate from you.      Your job, however, is to keep them safe-and that requires knowing there they are and who they are with. Let them know clearly that it's not because you want to dominate their life and control them; it's because it'sa safety issue for family members to keep track of one another.      When they're home and sit down to eat a meal, sit down with them. You need to open up to them about your life. Tell them of an interesting incident at the office, let them in on a bit of family gossip (闲谈), discussa piece of news with them. They are glad that you see them as old enough to be in on a few experiences of your life. By letting a teen in on your life, they just may let you in of theirs. 1. The underlined word "That" in Paragraph 2 probably refers to "_____". [     ]A. teens no longer tell parents their detailed informationB. teens don't tell parents where they had been any more C. parents are impatient to listen to their children D. parents are occupied by doing their business 2. It can be inferred from the passage that _____. [     ]A. the generation gap is becoming wider and widerB. teens quarrel a lot with their parents C. teens don't want to live with other family members D. some parents feel distant from their teenage children 3. The author believes that teens' one-word answers show _____. [     ]A. their awareness of independenceB. their physical and mental changesC. an unpleasant parent-child relationship D. their wishes for keeping silent 4. What's the main idea of the last paragraph? [     ]A. Parents should understand their children. B. parents should keep their children safe.C. Parents should open their hearts to their children. D. Parents should give their children enough freedom. 5. What's the author's purpose in writing the passage? [     ]A. To give advice B. To direct teenagers C. To present findings D. To comfort parents