1.小皮球掉进了大水缸,明明伸手拿不到,想什么办法拿出来呢?答案:往缸内注水。2.一百根做活用的针,掉到了地面上,用什么办法在一分钟之内都捡起来?答案:用磁铁(俗名吸铁石)。3.河边有一根圆粗木和一根粗铁棒,在没有船的情况下,佳佳想什么办法可以安全过河?答案:抱住圆粗木。4.两个体积一样大的铁球和皮球,扔到水里。谁沉到水底?谁浮在水面?答案:铁球沉底,皮球浮在水面。 1 small ball fell into the big tank, obviously reach out, think of any way out? Answer: to the cylinder water. 2. Hundreds of needles to work, fell to the ground, in what way to pick up in less than a minute? Answer: with magnet (commonly known as magnet). 3. The river has a rough wood and a thick iron bar, in the absence of the ship, Jia Jia think of any way to cross the river safely? 4. Two iron balls and the same size ball, thrown into the water. Who sink to the bottom? Who floats? Answer: iron ball sinking, the ball floating in the water.