____＝____＋____＋____
听说过“死海不死”吗？因为人在死海中即使不会游泳也不会沉下去，由此几位同学提出以下四种猜想，其中最合理的是（ ）
— It was ___________ who helped us out of danger.— What brave and helpful children! We should learn from them.
