题目

Three small fish lived in the sea. When they were very young, their parents died. They had to _____ each other day after day. Finally, they grew up and _____ to swim deeper and further.One morning, the three fish were _____ to a shallow(浅) water by a big wave(浪). A small boat was taken there too. It was hard for the fish to go back to the sea because the boat was right in front of them. The largest fish realized that they were _____ and said they had to find a way to leave there as fast as possible. The second largest fish _____ with his elder brother, but the youngest one did not. He said（2017•江西卷）如图所示，将边长为5cm的实心正方体木块轻轻放入装满水的溢水杯中，木块静止时，从杯中溢出水的质量为0.1kg（g取10N/kg）。求：（1）木块受到的浮力___；（2）木块的密度___；（3）木块下表面受到水的压强____。