C172 INSTRUCTOR SAFETY PLT GIVING AN INST CHK RIDE HAD NMAC WITH BE1900 ZMA CLASS E.

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I WAS PERFORMING AN INST CHK RIDE WITH A STUDENT UNDER THE HOOD IN THE L SEAT; AND ANOTHER CFI IN THE REAR R SEAT. WE WERE FOLLOWING ANOTHER C152 AT THE SAME ALT; ABOUT 3 MI AHEAD OF US IN THE WAY TO OUR PRACTICE AREA (15 MI W OF HWO). THE CFI IN THE BACK SEAT SCREAMED 'WATCH-OUT' TWICE; FOLLOWED BY 'DIVE; DIVE...' AT FIRST I THOUGHT HE MEANT WATCH OUT FOR THE C152; BUT WHEN HE SAID TO DIVE; I TOOK CTL OF THE ACFT AND CUT THE PWR AND PUSHED IT FORWARD. OUR BUTTS IMMEDIATELY CAME OFF THE SEATS; AND AS I STARTED THE MANEUVER; A BEECHCRAFT 1900 CAME FROM L TO R AT JUST ABOUT OUR SAME ALT. THE BEECH APPEARED TO BE IN A DSNDING R TURN. THIS ALL HAPPENED ABOUT 11 MI SSW OF FLL; WHICH LED ME TO BELIEVE THAT THE ACFT WAS ON AN EXTENDED DOG BASE LEG INTO FLL. (THEY SHOULD HAVE BEEN TALKING TO ATC.) AFTER WE LANDED; I REALIZED THAT THE CFI IN THE BACK SEAT SAW THE ACFT BEFORE I DID BECAUSE HIS SEAT IS A BIT LOWER THAN THE FRONT SEAT DURING CRUISE. AT THE TIME HE SCREAMED 'WATCH-OUT;' I COULDN'T SEE IT BECAUSE THE HIGH WING WAS BLOCKING MY VIEW. IT IS MY FEELING THAT THE B1900 WAS TALKING TO ATC; AND MAYBE ATC POINTED OUT TFC TO THEM BUT THEY MISTOOK US WITH THE PRECEDING C152. IT IS VERY COMMON FOR ATC TO BRING BIG AIRPLANES INTO FLL AT LOW ALTS WHEN THE CLOUD BASES ARE LOW. IN MY OPINION WE NEVER SHOULD HAVE GOTTEN THAT CLOSE. DOESN'T THAT AIRPLANE HAVE TCASII? WE GOT SO CLOSE THAT THE CFI IN THE BACK SEAT RECALLS SEEING A BLOND LADY SEATING NEAR THE WING WINDOW SEAT.