如图，小明作出了边长为1的第1个正△A₁B₁C₁，算出了正△A₁B₁C₁的面积．然后分别取△A₁B₁C₁三边的中点A₂、B₂、C₂，作出了第2个正△A₂B₂C₂，算出了正△A₂B₂C₂的面积．用同样的方法，作出了第3个正△A₃B₃C₃，算出了正△A₃B₃C₃的面积…，由此可得，第10个正△A₁₀B₁₀C₁₀的面积是（　　）

读图，完成下列各题。

   Time spent in a bookshop can be enjoyable. If you go to a 1shop, no assistant will come near to you and say “Can I help you? ” You 2buy anything you don’t want. You may try to 3where the book you want is. But if you can’t , the assistant will lead (引导 ) you there and then he will go away. It seems that he is4selling any books at all.
   Once a medical student found a very useful book in the shop, 5it was too expensive for him to buy. He couldn’t get it from the library, 6. So every afternoon, he went there to read7at a time. One day, however, he couldn’t find the book from its usual place and 8when he saw an assistant signing to him. To his surprise, the assistant pointed to the book in the corner, “I put 9 there so as not to be sold out,” said the assistant. Then he 10 the student to go on with his reading.