国 * * 密机关对涉密信息网络的保密原则不包括（）。A、同步建设 B、落实制度 C、严格审批

      Peter and Paul had got permission from their parents to camp in a field close to their
farm.But,being adventurous boys,they knew it would be more   1   to camp in the woods
that lay beyond the river.Excitedly,the boys   2   with their tent and food.
     Carrying their heavy   3  ,the two brothers walked along the riverbank,hardly noticing
the distance or the sun beating down.They were eager to reach their   4   before lunchtime.
As they entered the cool,shadowy woods,they began to search for a suitable camping spot.
Peter wanted to   5  close to the river at the edge of the woods,  6   Paul,who was older,
insisted that they camp further away.  7  ,Peter followed his brother deeper into the   8  .
"This really is a wonderful setting!" said Paul in excitement.They   9   their tent,and settled
down to eat the sandwiches they had made,then decided to find their way   10   to the river
to catch some fish.
     "Are you sure that this is the right   11  ?" whispered Peter shakily."I'm sure we passed that
hollow tree just a while ago." Paul walked   12   silently."Look,there it is again.We're lost,aren't
we?" complained Peter.Paul had to admit that he didn't know where they were.  13  ,they were
a long distance from where they were   14   to be.They were not even   15   of where they had
set up their camp.They set in   16   for a few minutes until Peter had a bright idea."Why don't we
look for clues(线索)the way that trackers   17   in the movies?We weren't careful about how we
 walked,so I'm sure we would have left   18   some broken tree branches and leaves."
     Carefully,the boys   19   the marks that they had left,until finally they found their campsite.
Hurriedly,they packed their belongings and set off   20   the direction of the river. 
      What would their parents think of their adventure?