Suppose(假设) you are going to Boston, and you 1 the city
before. If someone 2 you about the interesting places in the city, you __3 to get some ideas of what you will see. But don’t have a 4__ idea of where these places are or of how to find 5 . However, 6__ someone has a map of the city and 7 you the main roads and buildings, you may say, “ Oh, now I see . I can find my way with 8__ trouble at all ”. Working in math is somewhat（有点儿） like trying to find your way 9 a new city. Perhaps the words may tell you some information and you have 10 it, but you can’t
