A large gasoline spill in Brookfield closed part of Route 7 yesterday afternoon.  Brookfield firefighters responded to the southbound lanes to help clean up the spill from a truck.  15 to 20 gallons of fuel leaked from a ruptured  tank leaving puddles of gas along the shoulder. The state Department of Energy and Environmental Protection and State Police were notified.  About a quart mile of roadway was blocked off to slow traffic on the highway to protect crews cleaning up the spill.