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they collected about 150 nurse bees and divided them among six queenless mini hives equipped with baby bees to look after. Their findings suggest that nurse bees are indeed,by means of their royal jelly,passing antigens on to the queen for injection into her eggs.They also mean,because baby bees,too,receive royal jelly for the first few days after they hatch,that the nurses are injecting their baby bees vaccine as well.Each baby bee is therefore being vaccinated twice.Whether this is simply a belt-and- braces approach remains to be determined.But either way,it seems protective. 28.What is the surprise in paragraph 1? A.Honeybees got vaccination first. B.Human beings prefer living alone.